Symptom Troubleshooting [Engine Control System AJ)

• Symptom Troubleshooting Wiring Diagram
  • With Rear HO2S Model
    • With immobilizer system
    • Without immobilizer system
  • Without Rear HO2S Model
    • With immobilizer system
    • Without immobilizer system
• Control System Device And Control Relationship Chart
• Foreword
• Intermittent Concern Troubleshooting
  • Vibration Method
    • Notes
    • Inspection Method for Switch Connectors or Wires
    • Inspection Method for Sensor Connectors or Wires
    • Inspection Method for Sensors
    • Inspection Method for Actuators or Relays
  • Water Sprinkling Method
• Symptom Diagnostic Index
• Symptom Quick Diagnosis Chart
• No. 1 Melting Of Main Or Other Fuses
• No. 2 Mil Comes On
  • Notes
  • Diagnostic procedure
• No. 3 Will Not Crank
  • Notes
  • Diagnostic procedure
• No. 4 Hard Start/Long Crank/Erratic Start/Erratic Crank
  • Notes
  • Diagnostic procedure
• No. 5 Engine Stalls -- After Start/At Idle
  • Notes
  • Diagnostic procedure
• No. 6 Cranks Normally But Will Not Start
  • Notes
  • Diagnostic procedure
• No. 7 Slow Return To Idle
  • Notes
  • Diagnostic procedure
• No. 8 Engine Runs Rough/Rolling Idle
  • Notes
  • Diagnostic procedure
• No. 9 Fast Idle/Runs On
  • Notes
  • Diagnostic procedure
• No. 10 Low Idle/Stalls During Deceleration
  • Notes
  • Diagnostic procedure
• No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges
  • Notes
  • Diagnostic procedure
• No. 12 Lack/Loss Of Power-Acceleration/Cruise
  • Notes
  • Diagnostic procedure
• No. 13 Knocking/Pinging-Acceleration/Cruise
  • Notes
  • Diagnostic procedure
• No. 14 Poor Fuel Economy
  • Notes
  • Diagnostic procedure
• No. 15 Emission Compliance
  • Notes
  • Diagnostic procedure
• No. 16 High Oil Consumption/Leakage
  • Notes
  • Diagnostic procedure
• No. 17 Cooling System Concerns-Overheating
  • Notes
  • Diagnostic procedure
• No. 18 Cooling System Concerns-Runs Cold
  • Notes
  • Diagnostic procedure
• No. 19 Exhaust Smoke
  • Notes
  • Diagnostic procedure
• No. 20 Fuel Odor (In Engine Compartment)
  • Notes
  • Diagnostic procedure
• No. 21 Engine Noise
  • Notes
  • Diagnostic procedure
• No. 22 Vibration Concerns (Engine)
  • Notes
  • Diagnostic procedure
• No. 23 A/C Does Not Work Sufficiently
  • Notes
  • Diagnostic procedure
• No. 24 A/C Always On/A/C Compressor Runs Continuously
  • Notes
  • Diagnostic procedure
• No. 25 A/C Does Not Cut Off Under Wide Open Throttle Conditions
  • Notes
  • Diagnostic procedure
• No. 26 Exhaust Sulphur Smell
  • Notes
  • Diagnostic procedure
• No. 27 Fuel Refill Concerns
  • Notes
  • Diagnostic procedure
• No. 28 Fuel Filling Shut Off Issues
  • Notes
  • Diagnostic procedure
• No. 29 Constant Voltage
  • Notes
  • Diagnostic procedure
• No. 30 Spark Plug Condition
  • Notes
  • Diagnostic procedure
• Engine Control System Operation Inspection
  • Input Signal System Investigation Procedure
  • Finding unusual signals
  • Locating the source of unusual signals
    • Notes
    • Variable resistance type 1 (TP sensor and EGR boost sensor)
      • Notes
      • Investigate the input signal system for variable resistance type 1
      • Investigate the standard power supply system for variable resistance type 1
      • Investigate the GND system for variable resistance type 1
    • Variable resistance type 2 (fuel tank level sensor and mass air flow (MAF) sensor)
      • Notes
      • Investigate the GND system for variable resistance type 2
      • Investigate the input signal system for variable resistance type 2
      • Investigate the electrical supply system for variable resistance type 2
    • Thermistor type (IAT sensor and ECT sensor)
      • Notes
      • Investigate the input signal system for thermistor type
      • Investigate the GND system for thermistor type
  • Intake Manifold Vacuum Inspection
  • Idle Air Control Inspection
    • Engine coolant temperature compensation inspection
  • Intake Manifold Communication Control (IMCC) System Inspection
  • Fuel Injector Operation Inspection
  • Ignition Timing Control Inspection
  • Fuel Cut Control System Inspection
  • Fuel Pump Operation Inspection
  • Fuel Pump Control System Inspection
  • EGR Control System Inspection
  • Purge Control System Inspection
  • A/C Cut-off Control System Inspection
  • Spark Test
  • Evaporative Emission (EVAP) System Leak Inspection
    • Notes
    • EVAP system leak inspection using WDS or equivalent
      • EVAP system test outline
      • EVAP system test description
      • EVAP system malfunction judgment
      • Evaporative system test procedure
    • EVAP system leak inspection using leak tester