Engine Controls - Electrical Diagnostics

• Diagnosis And Testing
  • Notes
  • DTC P0040: 1/1 And 2/1 O2 Sensor Harness Connectors Reversed
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Powertrain Control Module
      • 2. Intermittent Wiring And Connectors
  • DTC P0101: MAF Sensor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0102: Mass Air Flow Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Jumper The MAF Sensor Signal And 5-Volt Supply Circuits
      • 3. Checking The 5-Volt Supply
      • 4. 5-Volt Supply Circuit Open
      • 5. 5-Volt Supply Circuit Shorted To Ground
      • 6. 5-Volt Supply Circuit Shorted To Voltage
      • 7. MAF Sensor Signal Circuit Open
      • 8. MAF Sensor Signal Circuit Shorted To Ground
      • 9. MAF Sensor Signal Circuit Shorted To Voltage
      • 10. Checking The Fused Engine Control Relay Output Circuit
      • 11. Check The Sensor Ground Circuit
      • 12. Sensor Ground Circuit Open
      • 13. Checking For Air Restrictions Or Leaks
      • 14. Intermittent Wiring And Connectors
  • DTC P0103: MAF Sensor Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0104: MAF Sensor Throttle Angle And Speed
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0106: Map Sensor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0107: Map Sensor Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Jumper The Map Sensor Signal And 5-Volt Supply Circuits
      • 3. Checking The 5-Volt Supply
      • 4. 5-Volt Supply Circuit Open
      • 5. 5-Volt Supply Circuit Shorted To Ground
      • 6. Map Sensor Signal Circuit Open
      • 7. Map Sensor Signal Circuit Shorted To Ground
      • 8. Intermittent Wiring And Connectors
  • DTC P0108: Map Sensor Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0112: Intake Air Temperature Sensor Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Pre-Diagnostic Check Out
      • 2. Check For Current DTC
      • 3. Jumper The IAT Sensor Signal And 5-Volt Supply Circuits
      • 4. Checking The 5-Volt Supply
      • 5. 5-Volt Supply Circuit Open
      • 6. 5-Volt Supply Circuit Shorted To Ground
      • 7. IAT Sensor Signal Circuit Open
      • 8. IAT Sensor Signal Circuit Shorted To Ground
      • 9. Intermittent Wiring And Connectors
  • DTC P0113: Intake Air Temperature Sensor Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Pre-Diagnostic Check Out
      • 2. Check For Current DTC
      • 3. IAT Sensor Signal Circuit Shorted To Voltage
      • 4. Check The Sensor Ground Circuit
      • 5. Sensor Ground Circuit Open
      • 6. 5-Volt Supply Circuit Shorted To Voltage
      • 7. Jumper The IAT Sensor Signal And 5-Volt Supply Circuits
      • 8. Intermittent Wiring And Connectors
  • DTC P0116: Engine Coolant Temperature Sensor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Pre-Diagnostic Check Out
      • 2. Monitor The ECT Sensor Temperature
      • 3. ECT Sensor
      • 4. ECT Sensor Signal Circuit Short To Voltage
      • 5. ECT Sensor
      • 6. Open ECT Sensor 5-Volt Supply Circuit
      • 7. Open ECT Sensor 5-Volt Supply Circuit
      • 8. ECT Sensor Signal Circuit Short To Ground
      • 9. Open ECT Sensor Signal Circuit
      • 10. Checking The Coolant Level And Condition
      • 11. ECT Sensor Range
      • 12. Checking Coolant Thermostat Operation
      • 13. Intermittent Wiring And Connectors
  • DTC P0116: Engine Coolant Temperature Sensor Short Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0117: Engine Coolant Temperature Sensor Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0118: Engine Coolant Temperature Sensor Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0120: Electronic Throttle Control Motor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. TP Sensor
      • 3. TP Sensor #1 And #2 Signal Circuit Shorted To Battery Voltage
      • 4. Resistance In The #1 And #2 TP Sensor Signal Circuits
      • 5. Resistance Between Ground And The TP Sensor Signal Circuit
      • 6. Resistance In The 5-Volt Supply Circuit
      • 7. Resistance To Ground In The 5-Volt Supply Circuit
      • 8. Open Sensor Ground Circuit
      • 9. TP Sensor #1 Signal Circuit Shorted To TP Sensor #2 Signal Circuit
      • 10. Pcm
      • 11. TP Sensor Sweep
      • 12. Intermittent Wiring And Connectors
  • DTC P0120: Throttle Position Sensor 1/2 Correlation
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0121: Apps 5-Volt Supply Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Apps 5-Volt Supply Shorted To Ground
      • 3. Apps 5-Volt Supply Shorted To (B+)
      • 4. Open Apps 5-Volt Supply
      • 5. Apps
      • 6. Intermittent Wiring And Connectors
  • DTC P0122: Apps Signal #1 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Apps Below 0.25 Of A Volt
      • 2. 5-Volt Supply Circuit
      • 3. Apps
      • 4. Apps #1 Signal Circuit Open
      • 5. Apps Signal Circuit Shorted To Ground
      • 6. 5-Volt Supply Circuit Open
      • 7. 5-Volt Supply Circuit Shorted To Ground
      • 8. Pcm
      • 9. Apps Sweep
      • 10. Intermittent Wiring And Connectors
  • DTC P0123: Apps Signal #1 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Apps #1 Voltage Above 3.5 Volts
      • 2. Apps
      • 3. Apps #1 Signal Circuit Shorted To Voltage
      • 4. Apps #1 Signal Circuit Shorted To 5-Volt Supply Circuit
      • 5. Open Apps #1 Ground Circuit
      • 6. Pcm
      • 7. Apps #1 Sweep
      • 8. Intermittent Wiring And Connectors
  • DTC P0128: Forced Limited Power Excessive High Coolant Temp
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Low Coolant Level
      • 2. Thermostat Operation
      • 3. Pcm
      • 4. Intermittent Wiring And Connectors
  • DTC P0128: Thermostat Rationality
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Checking The Coolant Level And Condition
      • 3. Thermostat Operation
      • 4. Intake Air Temp Sensor Operation
      • 5. ECT Sensor Operation
      • 6. Other Possible Causes
      • 7. Signal Circuit Shorted To Voltage
      • 8. Temperature Sensor Voltage Above 4.6 Volts
      • 9. ECT Sensor Voltage Below 1.0 Volts
      • 10. Signal Circuit Open
      • 11. Sensor Ground Circuit Open
      • 12. Signal Circuit Shorted To Ground
      • 13. Signal Circuit Shorted To Sensor Ground
      • 14. Intermittent Wiring And Connectors
  • DTC P0131: O2 Sensor 1/1 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Monitor The O2 Sensor Voltage
      • 2. O2 Sensor Voltage
      • 3. Disconnect The O2 Sensor
      • 4. O2 Sensor Signal Circuit Shorted To Voltage
      • 5. Disconnect The O2 Sensor
      • 6. O2 Sensor Signal Circuit Short To Ground
      • 7. O2 Sensor System Inspection
      • 8. Jumper The O2 Sensor
      • 9. O2 Sensor Signal Circuit Open
      • 10. O2 Sensor Ground Circuit Open
      • 11. Intermittent Wiring And Connectors
  • DTC P0132: O2 Sensor 1/1 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0133: O2 Sensor 1/1 Short Delay Time
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Exhaust Leak
      • 3. O2 Sensor Signal Circuit
      • 4. O2 Sensor Ground Circuit
      • 5. Intermittent Wiring And Connectors
  • DTC P0133: O2 Sensor 1/1 Long Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0133: O2 Sensor 1/1 Long Delay Time
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0133: O2 Sensor 1/1 Short Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0134: O2 Sensor 1/1 Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0135: O2 Sensor 1/1 Heater Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. O2 Heater Element
      • 2. O2 Heater Control Circuit Shorted To Ground
  • DTC P0135: O2 Sensor 1/1 Heater Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Pcm
      • 3. O2 Sensor Heater Control Circuit Short To Ground
      • 4. O2 Sensor Heater Control Circuit Shorted To Voltage
      • 5. O2 Sensor Heater Control Circuit Open
      • 6. O2 Sensor Heater Fused Engine Control Relay Output Circuit
      • 7. Intermittent Wiring And Connectors
  • DTC P0135: O2 Sensor 1/1 Heater Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. O2 Sensor Heater Operation
      • 3. O2 Heater Element
      • 4. O2 Heater Fused Engine Control Relay Output Circuit Open
      • 5. O2 Heater Control Circuit Open
      • 6. Intermittent Wiring And Connectors
  • DTC P0135: O2 Sensor 1/1 Heater Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0137: O2 Sensor 1/2 Below Threshold
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0137: O2 Sensor 1/2 Above Threshold
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0137: O2 Sensor 2/2 Above Threshold
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Exhaust Leak
      • 3. O2 Signal Circuit
      • 4. O2 Ground Circuit
      • 5. Intermittent Wiring And Connectors
  • DTC P0137: O2 Sensor 2/2 Below Threshold
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0138: O2 Sensor 1/2 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0138: O2 Sensor 1/2 Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0138: O2 Sensor 2/2 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0138: O2 Sensor 2/2 Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0140: O2 Sensor 1/2 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0140: O2 Sensor 2/2 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0141: O2 Sensor 1/2 Heater Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0141: O2 Sensor 1/2 Heater Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0141: O2 Sensor 1/2 Heater Circuit High
    • Circuit Diagram & Connector Diagram
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0141: O2 Sensor 1/2 Heater Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0151: O2 Sensor 2/1 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0152: O2 Sensor 2/1 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0153: O2 Sensor 2/1 Long Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0153: O2 Sensor 2/1 Long Delay Time
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0153: O2 Sensor 2/1 Short Delay Time
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0153: O2 Sensor 2/1 Short Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0154: O2 Sensor 2/1 Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0155: O2 Sensor 2/1 Heater Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0155: O2 Sensor 2/1 Heater Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0155: O2 Sensor 2/1 Heater Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0155: O2 Sensor 2/1 Heater Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0161: O2 Sensor 2/2 Heater Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0161: O2 Sensor 2/2 Heater Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0161: O2 Sensor 2/2 Heater Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0161: O2 Sensor 2/2 Heater Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0171: Fuel System 1/1 UNDERCORRECTION Of Fuel Mixture (Off Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0171: Fuel System 1/1 Rich Control Over Limit (At Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0171: Fuel System 1/1 Rich Control Over Limit (At Load)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Checking Fuel Pressure
      • 3. O2 Sensor Operation
      • 4. EVAP Purge Solenoid Operation
      • 5. Map Sensor Operation
      • 6. ECT Sensor Operation
      • 7. Engine Mechanical Problem
      • 8. O2 Sensor
      • 9. O2 Signal Circuit
      • 10. O2 Sensor Ground Circuit
      • 11. Intermittent Wiring And Connectors
  • DTC P0172: Fuel System 1/1 OVERCORRECTION Of Fuel Mixture (At Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0172: Fuel System 1/1 Lean Control Below Limit (At Load)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Checking Fuel Pressure
      • 3. O2 Sensor Operation
      • 4. O2 Sensor Heater Operation
      • 5. Map Sensor Operation
      • 6. ECT Sensor Operation
      • 7. Engine Mechanical Problem
      • 8. O2 Sensor
      • 9. O2 Sensor Signal Circuit
      • 10. O2 Sensor Ground Circuit
      • 11. Fuel Strainer
      • 12. Intermittent Wiring And Connectors
  • DTC P0172: Fuel System 1/1 Lean Control Below Limit (At Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0173: Fuel System 2/1 Rich Control Over Limit (At Load)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Checking Fuel Pressure
      • 3. O2 Sensor Operation
      • 4. O2 Sensor Heater Operation
      • 5. Map Sensor Operation
      • 6. ECT Sensor Operation
      • 7. Engine Mechanical Problem
      • 8. O2 Sensor
      • 9. O2 Sensor Signal Circuit
      • 10. O2 Sensor Ground Circuit
      • 11. Fuel Strainer
      • 12. Intermittent Wiring And Connectors
  • DTC P0174: Fuel System 2/1 Rich Control Over Limit (At Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0174: Fuel System 2/1 Rich Control Over Limit (At Load)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0174: Fuel System 2/1 Lean Control Below Limit (At Load)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0174: Fuel System 2/1 UNDERCORRECTION Of Fuel Mixture (Off Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0175: Fuel System 2/1 OVERCORRECTION Of Fuel Mixture (Off Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0175: Fuel System 2/1 Lean Control Bellow Limit (At Idle)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0200: Fuel Injector Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0201: Fuel Injector #1 Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Fused Engine Control Relay Output Circuit Open
      • 3. Injector Control Circuit Open
      • 4. Injector Control Circuit Shorted To Ground
      • 5. Fused Engine Control Relay Output Circuit Shorted To Injector Control Circuit
      • 6. Fuel Injector
      • 7. Intermittent Wiring And Connectors
  • DTC P0202: Fuel Injector #2 Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0203: Fuel Injector #3 Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0204: Fuel Injector #4 Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0205: Fuel Injector #5 Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0206: Fuel Injector #6 Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0211: Throttle Actuator Stuck
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Throttle Plate Stuck Open
      • 3. TP #1 And TP #2 Both Equal 2.5 Volts
      • 4. Throttle Control Motor 1 Circuit Shorted To Voltage
      • 5. Throttle Control Motor 1 CKT Open
      • 6. Throttle Control Motor 2 Circuit Open
      • 7. Throttle Control Motor 1 Circuit Shorted To Ground
      • 8. Throttle Control Motor 2 Circuit Shorted To Ground
      • 9. Pcm
      • 10. Intermittent Wiring And Connectors
      • 3. Throttle Control Motor 2 Circuit Short To Voltage
      • 4. Throttle Control Motor 1 CKT Open
      • 5. Throttle Control Motor 2 Circuit Open
      • 6. Throttle Control Motor 1 Circuit Shorted To Ground
      • 7. Throttle Control Motor 2 Circuit Shorted To Ground
      • 8. Pcm
      • 9. Intermittent Wiring And Connectors
  • DTC P0221: Apps Sensor #1 And #2 Voltage Correlation
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Open Apps Signal Circuits
      • 3. Open 5-Volt Supply Circuit
      • 4. Open Apps Ground Circuits
      • 5. Checking Apps #1 And #2 W/ Lab Scope
      • 6. Pcm
      • 7. Intermittent Wiring And Connectors
  • DTC P0221: Idle Speed Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Air Intake System
      • 3. Vacuum Leaks
      • 4. Throttle Body Operation
      • 5. Pcm
      • 6. Intermittent Wiring And Connectors
  • DTC P0221: Electronic Throttle Control Module Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0221: Electronic Throttle Control Module Processor
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0222: Apps Signal #2 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Apps Below 0.25 Volt
      • 2. 5-Volt Supply Circuit
      • 3. Apps
      • 4. Apps #2 Signal Circuit Open
      • 5. Apps Signal Circuit Shorted To Ground
      • 6. 5-Volt Supply Circuit Open
      • 7. 5-Volt Supply Circuit Shorted To Ground
      • 8. Pcm
      • 9. Apps Sweep
      • 10. Intermittent Wiring And Connectors
  • DTC P0223: Apps Signal #2 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Apps #2 Voltage Above 5.0 Volts
      • 2. Apps
      • 3. Apps #2 Signal Circuit Shorted To Voltage
      • 4. Apps #2 Signal Circuit Shorted To 5-Volt Supply Circuit
      • 5. Open Apps #2 Ground Circuit
      • 6. Pcm
      • 7. Apps #2 Sweep
      • 8. Intermittent Wiring And Connectors
  • DTC P0300: Multiple Cylinder Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Visual And Physical Inspection
      • 3. Ignition System Operation
      • 4. Spark Plug
      • 5. Checking Fuel Pressure
      • 6. Checking Fuel Leak Down
      • 7. Fuel Injector Operation
      • 8. Checking For Possible Mechanical Problem
      • 9. Engine Control Relay Output Circuit
      • 10. Fuel Injector
      • 11. Fuel Injector Control Circuit Shorted To Voltage
      • 12. Fuel Injector Control Circuit Shorted To Ground
      • 13. Open Fuel Injector Control Circuit
      • 14. Restricted Fuel Supply Line
      • 15. Fuel Strainer
      • 16. Fused Ignition Switch Output Circuit
      • 17. Coil On Plug
      • 18. Coil On Plug Driver Circuit
      • 19. Intermittent Misfire
  • DTC P0301: Cylinder #1 Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Visual And Physical Inspection
      • 2. Ignition System Operation
      • 3. Spark Plug
      • 4. Checking Fuel Pressure
      • 5. Checking Fuel Leak Down
      • 6. Fuel Injector Operation
      • 7. Checking For Possible Mechanical Problem
      • 8. Engine Control Relay Output Circuit
      • 9. Fuel Injector
      • 10. Injector Driver Circuit
      • 11. Restricted Fuel Supply Line
      • 12. Fuel Strainer
      • 13. Fused Ignition Switch Output Circuit
      • 14. Coil On Plug
      • 15. Coil On Plug Driver Circuit
      • 16. Intermittent Misfire
  • DTC P0302: Cylinder #2 Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0303: Cylinder #3 Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0304: Cylinder #4 Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0305: Cylinder #5 Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0306: Cylinder #6 Misfire
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0325: Knock Sensor #1 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Knock Sensor Resistance
      • 2. Knock Sensor Signal Circuit Shorted To Ground
      • 3. Sensor Ground Circuit Shorted To Ground
      • 4. Sensor Ground Circuit Shorted To Voltage
      • 5. Knock Sensor Signal Circuit Shorted To Voltage
      • 6. Open Knock Sensor Signal Circuit
      • 7. Open Sensor Ground Circuit
  • DTC P0325: Knock Sensor #1 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0330: Knock Sensor #2 Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0330: Knock Sensor #2 Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0335: Crankshaft Position Sensor Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. CKP Wire Harness Inspection
      • 3. CKP Sensor Signal Circuit
      • 4. CKP Sensor Ground Circuit
      • 5. CKP Sensor Ground Circuit Shorted To Voltage
      • 6. CKP Sensor Ground Circuit Shorted To Ground
      • 7. Open CKP Sensor Ground Circuit
      • 8. CKP Sensor Signal Circuit Shorted To Voltage
      • 9. CKP Sensor Signal Circuit Shorted To Ground
      • 10. Open CKP Sensor Signal Circuit
      • 11. Tone Wheel/Pulse Ring Inspection
      • 12. Intermittent Wiring And Connectors
  • DTC P0341: Camshaft Position Timing Over-Retarded
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Checking CMP Signal
      • 3. CMP Wire Harness Inspection
      • 4. Tone Wheel/Pulse Ring Inspection
      • 5. Camshaft Position Sensor
      • 6. Intermittent CMP Signal
      • 7. Intermittent Wiring And Connectors
  • DTC P0341: Camshaft Position Timing Over-Advanced
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0341: Camshaft Position Sensor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Fused Engine Control Relay Output Circuit Open
      • 2. Sensor Ground Circuit Open
      • 3. CMP Signal Circuit Shorted To Voltage
      • 4. CMP Signal Circuit Shorted To Ground
      • 5. CMP Signal Circuit Open
      • 6. Camshaft Position Sensor
  • DTC P0400: EGR System Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. EGR Operation
      • 2. EGR Valve Open At Idle
      • 3. EGR Solenoid
      • 4. Fused Engine Control Relay Output Circuit Open
      • 5. EGR Solenoid Control Circuit Short To Ground
      • 6. EGR Solenoid Control Circuit Open
      • 7. EGR Solenoid Control Circuit Shorted To Voltage
  • DTC P0403: EGR Control Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0410: Secondary Air Injection System
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Inspect The Secondary Air Injection System
      • 3. Operate The Air Pump
      • 4. Air Pump Switchover Valve Vacuum Check
      • 5. Monitor The O2 Sensors
      • 6. Air Pump Solenoid Vacuum Check
      • 7. Disconnect The Air Pump
      • 8. Air Pump Ground Circuit Open
      • 9. Inspect The Air Pump Fuse
      • 10. Air Pump Fuse Open
      • 11. Jumper The Air Pump Relay
      • 12. Intermittent Wiring And Connectors
  • DTC P0410: Secondary Air Injection Relay Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Operate The Air Pump Relay
      • 2. Powertrain Control Module
      • 3. Air Pump Relay Control Circuit Short To Ground
      • 4. Open Air Pump Relay Control Circuit
      • 5. Intermittent Wiring And Connectors
  • DTC P0412: Secondary Air Injection Switchover Solenoid Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Actuate The Secondary Air Pump Switchover Solenoid
      • 2. Testing The Fused Engine Control Relay Output And Ground Circuit Of The Secondary Air Pump Switchover Solenoid.
      • 3. Checking The Fused Engine Control Relay Output Circuit At The Air Pump Switchover Solenoid
      • 4. Checking The Air Pump Switchover Solenoid Control Circuit
      • 5. Intermittent Wiring And Connectors
  • DTC P0422: Catalytic 1/1 Efficiency
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Inspect The TWC Converter
      • 2. Inspect For Exhaust Leaks
  • DTC P0432: Catalytic 2/1 Efficiency
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Inspect The Three Way Catalytic Converter
      • 2. Inspect For Exhaust Leaks
  • DTC P0440: General EVAP System Failure
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0441: EVAP Purge Valve
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0442: EVAP System Small Leak
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0445: EVAP Purge Solenoid Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Fused Engine Control Relay Output Circuit Open
      • 3. Disconnect The Pcm
      • 4. EVAP Purge Solenoid Control Circuit Current Flow
      • 5. EVAP Purge Solenoid Control Circuit Fault
      • 6. Intermittent Wiring And Connectors
  • DTC P0446: Charcoal Canister Shutoff Valve
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Charcoal Canister Shutoff Valve
      • 2. Checking The Fused Engine Control Relay Output Circuit To The Charcoal Canister Shutoff Valve
      • 3. Checking The Charcoal Canister Shutoff Valve Control Circuit For An Open
      • 4. Charcoal Canister Shutoff Valve Control Circuit Short To Ground.
  • DTC P0446: EVAP Purge Solenoid Stuck Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Checking EVAP Purge Solenoid Functionality
      • 3. EVAP Vacuum Supply Hose Inspection
      • 4. Intermittent Wiring And Connectors
  • DTC P0451: Fuel Tank Pressure Sensor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Reading Fuel Tank Pressure
      • 2. Fuel Tank Pressure Sensor Signal Shorted To Voltage
      • 3. Open Fuel Tank Pressure Sensor Ground Circuit
      • 4. Fuel Tank Pressure Sensor
      • 5. Fuel Tank Pressure Sensor 5-Volt Supply
      • 6. Fuel Tank Pressure Sensor 5-Volt Supply Shorted To Ground
      • 7. Open Fuel Tank Pressure Sensor 5-Volts Supply Circuit
      • 8. Open Fuel Tank Pressure Sensor Signal
      • 9. Fuel Tank Pressure Sensor Signal Shorted To Ground
  • DTC P0452: Fuel Tank Pressure Sensor Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0453: Fuel Tank Pressure Sensor Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0455: EVAP System Large Leak
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Visual And Physical Inspection
      • 3. Verify Evaporative Mission Leak
      • 4. Evaporative Emission Leak Detection
      • 5. EVAP Purge Solenoid Operation
      • 6. Fuel Tank Pressure Sensor Operation
      • 7. Intermittent Condition
  • DTC P0457: EVAP Purge Valve Leaking
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0460: Fuel Level Sensor Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Diagnostic Test
      • 1. Fuel Gauge Operation
  • DTC P0500: No Vehicle Speed Signal (Cab Can Message)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Controller Antilock Brake (Cab).
  • DTC P0500: Vehicle Speed Performance Esp Mil Request
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Cab.
  • DTC P0561: Battery System Voltage
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If Battery Voltage DTC Is Current
      • 2. Engine Control Fuse #1 Output Circuit
      • 3. Pcm
      • 4. Engine Control Relay Output Circuit
      • 5. Intermittent Wiring And Connectors
  • DTC P0562: Battery System Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0563: Battery System High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0571: Stop Lamp Switch Can Signal Lost To Trans Performance
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Controller Antilock Brake (Cab)
  • DTC P0571: Stop Lamp Switch Signal Performance
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Controller Antilock Brake (Cab)
  • DTC P0600: Incorrect Can Message From EIS Control Module
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In EIS Module.
  • DTC P0600: No Can Message From Cab Module
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If Cab DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can C Bus Termination
      • 4. Pcm Can C Bus Termination
      • 5. SKREEM Termination
      • 6. Can C Bus (-) Circuit Open
      • 7. Can C Bus (+) Circuit Open
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From Cab To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P0600: No Transmission Bus Message
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If TCM DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can C Bus Termination
      • 4. Pcm Can C Bus Termination
      • 5. SKREEM Termination
      • 6. Can C Bus (-) Circuit Open
      • 7. Can C Bus (+) Circuit Open
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From TCM To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P0600: Lost Comm With Electric Gear Shift Module (SLA)
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If SLA DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can C Bus Termination
      • 4. Pcm Can C Bus Termination
      • 5. SKREEM Termination
      • 6. Can C Bus (-) Circuit Open
      • 7. CAN C Bus (+) CIRCUIT OPEN
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From SLA To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P0600: No Cluster Bus Message
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If Instrument Cluster DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can C Bus Termination
      • 4. Pcm Can C Bus Termination
      • 5. SKREEM Termination
      • 6. Can C Bus (-) Circuit Open
      • 7. Can C Bus (+) Circuit Open
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From Instrument Cluster To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P0602: Pcm Programmed Incorrect Trans/No Comm From TCM
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P0700: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0702: Transmission Control Module Low Voltage
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0702: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0702: Loss Of Torque Management Signal
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0702: TCM Torque Management Request Performance
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0705: SLA Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Shift Lever Assembly (SLA).
  • DTC P0705: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0715: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0720: Transmission Incorrect Torque Request From Esp
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If TCM DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can C Bus Termination
      • 4. Pcm Can C Bus Termination
      • 5. SKREEM Termination
      • 6. Can C Bus (-) Circuit Open
      • 7. Can C Bus (+) Circuit Open
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From TCM To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P0720: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0730: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0740: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0743: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0748: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0753: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0758: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P0763: Transmission Control System (Mil Request)
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In Transmission Control Module (TCM)
  • DTC P1386: Knock Sensor System Failure
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check Pcm For Internal Failure DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P1600: Rough Road Detected
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If Cab DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can Bus Termination
      • 4. Pcm Can Bus Termination
      • 5. SKREEM Termination
      • 6. Can Bus (-) Circuit Open
      • 7. Can C Bus (+) Circuit Open
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From Cab To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P2513: Enhanced Accident Report Driver Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Active DTC
      • 2. Enhanced Accident Report Driver Signal Circuit Shorted To Voltage
      • 3. Enhanced Accident Report Driver Signal Circuit Shorted To Ground
      • 4. Enhanced Accident Report Driver Signal Circuit Open
      • 5. Orc
      • 6. Intermittent Wiring And Connectors
  • DTC P2513: Enhanced Accident Report Driver Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • DTC P2545: Esp Torque Management Request Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check To See If Cab DTCS Are Present
      • 2. Verify DTCS
      • 3. Pcm And SKREEM Can C Bus Termination
      • 4. Pcm Can C Bus Termination
      • 5. SKREEM Termination
      • 6. Can C Bus (-) Circuit Open
      • 7. Can C Bus (+) Circuit Open
      • 8. Can C Bus (+) Circuit Shorted To Voltage
      • 9. Can C Bus (-) Circuit Shorted To Voltage
      • 10. Can C Bus (-) Circuit Short To Ground
      • 11. Can C Bus (-) Circuit Open From Cab To Pcm
      • 12. Intermittent Wiring And Connectors
  • DTC P2561: HVAC Control Module Requested Mil Illumination
    • Circuit Diagram & Connector Identification
    • Diagnostic Test
      • 1. DTC Present In A/C Heater Control Module.
• Circuit Tests
  • Cooling Fan Control Circuit Open
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Radiator Fan Control Module
      • 2. Radiator Fan Control Circuit Open
      • 3. Radiator Fan Control Circuit Shorted To Ground
      • 4. Radiator Fan Control Circuit Shorted To Voltage
  • Cooling Fan Control Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • Cooling Fan Control Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • Engine Oil Sensor Level Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Checking For Oil Sensor DTCS
      • 2. Checking For Oil Sensor Level DTC
      • 3. 5-Volt Supply Circuit
      • 4. 5-Volt Supply Circuit Shorted To Voltage
      • 5. 5-Volt Supply Circuit Shorted To Ground
      • 6. 5-Volt Supply Circuit Open
      • 7. Open Oil Sensor Ground Circuit
      • 8. Oil Sensor Signal Circuit Open
      • 9. Oil Sensor Signal Circuit Shorted To Ground.
      • 10. Intermittent Wiring And Connectors
  • Engine Oil Sensor Over Temperature
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Checking For Oil Sensor DTCS
      • 2. Checking For Oil Sensor Level DTC
      • 3. 5-Volt Supply Circuit
      • 4. 5-Volt Supply Circuit Shorted To Voltage
      • 5. 5-Volt Supply Circuit Shorted To Ground
      • 6. 5-Volt Supply Circuit Open
      • 7. Open Oil Sensor Ground Circuit
      • 8. Open Oil Sensor Signal Circuit
      • 9. Oil Sensor Signal Circuit Shorted To Ground.
      • 10. Intermittent Wiring And Connectors
  • Engine Oil Sensor Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • Engine Oil Sensor Quality Performance
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Checking For Oil Sensor DTCS
      • 2. Checking For Oil Sensor Quality DTCS
      • 3. 5-Volt Supply Circuit
      • 4. 5-Volt Supply Circuit Shorted To Voltage
      • 5. 5-Volt Supply Circuit Shorted To Ground
      • 6. 5-Volt Supply Circuit Open
      • 7. Open Oil Sensor Ground Circuit
      • 8. Oil Sensor Signal Circuit Open
      • 9. Oil Sensor Signal Circuit Shorted To Ground.
      • 10. Intermittent Wiring And Connectors
  • Engine Oil Sensor Water Contamination
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • Safety Fuel Shut Off Detected
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Throttle Plate Stuck Open
      • 3. Throttle Control Motor 2 Circuit Short To Voltage
      • 4. Throttle Control Motor 1 Circuit Open
      • 5. Throttle Control Motor 2 Circuit Open
      • 6. Throttle Control Motor 1 Circuit Shorted To Ground
      • 7. Throttle Control Motor 2 Circuit Shorted To Ground
      • 8. Pcm
      • 9. Intermittent Wiring And Connectors
  • Short Runner Solenoid Circuit High
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Checking Short Runner Valve Solenoid Operation With The DRB III(R)
      • 2. Fused Engine Control Relay Output Circuit
      • 3. Checking The Short Runner Value Solenoid
      • 4. Checking The Short Runner Value Solenoid Control Circuit For A Short To Voltage
      • 5. Checking The Short Runner Value Solenoid Control Circuit For A Short To Ground
      • 6. Checking Short Runner Value Solenoid Control Circuit For An Open
      • 7. Intermittent Wiring And Connectors
  • Short Runner Solenoid Circuit Low
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • Short Runner Solenoid Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Check For Current DTC
      • 2. Intermittent Wiring And Connectors
  • Speed Control Switch Input Circuit
    • Circuit Diagram & Connector Identification
    • When Monitored and Set Condition
    • Possible Causes
    • Diagnostic Test
      • 1. Pcm
      • 2. Speed Control Off Signal Circuit Short To Ground
      • 3. Speed Control Of Signal Circuit Open
      • 4. Open Fused Ignition Switch Output Circuit
  • *Checking Fuel Delivery
    • Circuit Diagram & Connector Identification
    • Possible Causes
    • Diagnostic Test
      • 1. Fuel Pump Operation
      • 2. Fuel Pressure
      • 3. Checking Fuel Strainer
      • 4. Fuel Pump Relay Output Circuit Open
      • 5. Fuel Pump
  • *Checking Hard Start (Fuel System)
    • Circuit Diagram & Connector Identification
    • Possible Causes
    • Diagnostic Test
      • 1. Checking Fuel Pressure
      • 2. Restricted Fuel Filter
      • 3. Checking Fuel Strainer
      • 4. Fuel Injector(S)
  • *Engine Cranks But Does Not Start
    • Circuit Diagram & Connector Identification
    • Possible Causes
    • Diagnostic Test
      • 1. No Start Pre-Test
      • 2. Open Fuse
      • 3. Checking For Secondary Indicators
      • 4. Possible Mechanical Problems
      • 5. Fuel Pump Relay Output CKT Open
      • 6. Fuel Pump Delivery
  • *Intermittent No Crank
    • Circuit Diagram & Connector Identification
    • Possible Causes
    • Diagnostic Test
      • 1. Etc Starter Inhibit
• Verification Tests
  • Powertrain Verification Test - VER 1
    • 1.
  • Powertrain Verification Test - VER 2
    • 1.
  • Powertrain Verification Test - VER 3
    • 1.
  • Powertrain Verification Test - VER 4
    • 1.
  • Powertrain Verification Test - VER 5
    • 1.
• Schematics And Diagrams