Engine Controls - System & Component Tests

• * Please Read This First *
• Model Identification
• Introduction
• Air Induction Systems
  • Notes
  • Turbocharger (6.5L Diesel)
• Computerized Engine Controls
  • Pcm Output Diagnosis (2.2L - VIN 4)
    • Notes
    • Diagnostic Aids
  • Pcm Power & Ground Check
    • Notes
    • Ground Circuits
    • Power Circuits
    • PCM Harness Resistance
  • Powertrain Control Module Connector Terminal Identification
    • Notes
    • Powertrain Control Module Harness Connector End View & Terminal Identification (2.2L - VIN 4)
      • Notes
      • Powertrain Control Module Connector Terminal Identification (2.2L - VIN 4)
    • Powertrain Control Module Harness Connector End View & Identification (3.4L)
      • Notes
      • Powertrain Control Module Connector Terminal Identification (3.4L)
    • Powertrain Control Module Harness Connector End View & Terminal Identification (4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L & 7.4L)
      • Notes
      • Powertrain Control Module Connector Terminal Identification (4.3L - ASTRO & SAFARI)
      • Powertrain Control Module Connector Terminal Identification (4.3L - BLAZER, BRAVADA, ENVOY, JIMMY, SONOMA & S10 PICKUP)
      • Powertrain Control Module Connector Terminal Identification (4.3L - EXPRESS & SAVANA)
      • Powertrain Control Module Connector Terminal Identification (4.3L - SIERRA & SILVERADO)
      • Powertrain Control Module Connector Terminal Identification (4.8L, 5.3L & 6.0L)
      • Powertrain Control Module Connector Terminal Identification (5.0L & 5.7L GASOLINE - ESCALADE, EXPRESS, SAVANA, PICKUP, TAHOE & YUKON)
      • Powertrain Control Module Connector Terminal Identification (5.0L & 5.7L - EXPRESS & SAVANA)
      • Powertrain Control Module Connector Terminal Identification (5.7L CNG - PICKUP)
      • Powertrain Control Module Connector Terminal Identification (7.4L - EXPRESS & SAVANA)
      • Powertrain Control Module Connector Terminal Identification (7.4L - PICKUP)
    • Powertrain Control Module Harness Connector End View & Terminal Identification (6.5L)
      • Notes
      • Powertrain Control Module Connector Terminal Identification (6.5L - EXPRESS & SAVANA)
      • Powertrain Control Module Connector Terminal Identification (6.5l - PICKUP)
• Engine Sensors & Switches
  • Notes
  • Engine Coolant Temperature Sensor
    • Notes
    • Engine Coolant Temperature Sensor Resistance Specifications
  • Intake Air Temperature Sensor
    • Notes
    • Intake Air Temperature Sensor Resistance Specifications
  • Map Sensor Circuit
    • Notes
    • 2.2L (VIN 4)
    • 3.4L
  • Engine Oil Level Switch
• Modules, Motors, Relays & Solenoids
  • Notes
  • Relays
    • A/C Compressor Clutch Relay
    • Fuel Pump Relay
  • Solenoids
    • EVAP Canister Purge Solenoid
    • Idle Air Control (IAC) Valve
    • Torque Converter Clutch (TCC) Solenoid
• Fuel System (Gasoline)
  • Notes
  • Fuel Delivery
    • Fuel Pressure Regulator (CSI)
    • Fuel Pressure Regulator (SFI)
    • Fuel Pump Oil Pressure Switch (Back-Up Circuit)
  • Fuel Control
    • Notes
    • Fuel Injector Circuit Diagnosis (Except 2.2L & 3.4L)
    • Injector Balance Test (2.2L - VIN 4 & 3.4L)
    • Injector Balance Test (Except 2.2L & 3.4L)
    • Injector Coil Test (Except 2.2L & 3.4L)
    • Injector Coil Test - ECT Is 50-95°F (2.2L - VIN 4)
    • Injector Coil Test - ECT Is 50-95°F (3.4L)
    • Injector Coil Test - ECT Is Not 50-95°F (2.2L - VIN 4)
    • Injector Coil Test - ECT Is Not 50-95°F (3.4L)
    • Fuel Pump Relay
• Fuel System (Diesel)
  • Notes
  • Normal Glow Plug Circuit Operation
    • Function Check
  • Preliminary Glow Plug Diagnosis
  • Fuel Heater Diagnosis
  • Water-In-Fuel Light Diagnosis
  • Glow Plug System Diagnosis
  • Glow Plug Relay
  • Injection Pump Housing Leakage Test
  • Injectors
    • Test Preparation
    • Opening Pressure Test
    • Leakage Test
    • Chatter Test
    • Spray Pattern Test
• Fuel System (CNG)
  • Fuel System Diagnosis (Alternative Fuel)
    • Circuit Description
    • Diagnostic Procedure
  • Unwanted Switch To Gasoline
    • Circuit Description
    • Diagnostic Procedure
  • Fuel Gauge Selector Switch/Fuel Indicator Light
  • AF Fuel Pump Relay
  • Lock-Off Relay
  • Fuel Gauge Relay
  • CNG Fuel Gauge Reading Inaccurate
    • Notes
    • CNG Fuel System Specifications
• Idle Control System
  • Notes
  • Idle Air Control System Diagnosis
    • Notes
    • IAC Valve Harness Connector End View
• Ignition System
  • Notes
  • Ignition Relay (CNG)
  • Timing Control Systems
    • Ignition Control Circuit (Gasoline Engines)
    • Knock Sensor Circuit (Models Using External Spark Controller Module)
    • Knock Sensor Circuit (Models Using Knock Sensor With Internal Spark Controller Module)
• Emission Systems & Sub-Systems (Gasoline)
  • Notes
  • Air Injection
    • Secondary Air Injection System Diagnosis (5.0L & 5.7L "C" & "K" Series)
    • Secondary Air Injection System Diagnosis (7.4L)
  • Exhaust Gas RECIRCULATION
    • EGR System Diagnosis
      • Notes
      • EGR Valve Harness Connector End View
  • Fuel Evaporation
    • Notes
    • EVAP Control System Diagnosis (2.2L - VIN 4)
    • EVAP Control System Diagnosis (3.4L)
    • EVAP Control System Diagnosis (Except 2.2L & 3.4L)
    • Fuel Tank Pressure Sensor Diagnosis (3.4L)
  • Positive Crankcase Ventilation
    • Required Service
    • Checking PCV Valve Function
• Emission Systems & Sub-Systems (Diesel)
  • Notes
  • Positive Crankcase Ventilation
    • Crankcase Depression Regulator (CDR) Valve
  • Exhaust Gas RECIRCULATION
    • EGR Valve Check
  • Vacuum Pump
• Miscellaneous Controls
  • Notes
  • A/C Compressor Clutch Controls
  • Electric Cooling Fan Control
  • Pcm Controlled Warning Lights & Gauges
    • Generator Circuit Diagnosis (2.2L - VIN 4)
    • Shift Light Circuit Diagnosis (Manual Transmission)
    • Tachometer Control Circuit Diagnosis (4.3L)
    • Warning Light Circuit Diagnosis (3.4L)
  • Transmission
    • Notes
    • Torque Converter Clutch (TCC) Solenoid
    • Torque Converter Lock-Up Signal At Transmission
    • Torque Converter Lock-Up Signal From PCM
• Component Locations
  • Component Locations 2.2L (VIN 4) "S" Series
  • Component Locations 3.4L (VIN E) "U" Series
  • Component Locations 4.3L (VIN W) "G" Series
  • Component Locations 4.3L (VIN W) "L" & "M" Series
  • Component Locations 4.3L (VIN W & X) "S" & "T" Series
  • Component Locations 4.8L (VIN V), 5.3L (VIN T) & 6.0L (VIN U) "C" & "K" Series
  • Component Locations 5.0L (VIN M), 5.7L (VIN R) & 7.4L (VIN J) "C" & "K" Series
  • Component Locations 5.0L (VIN M) & 5.7L (VIN R) "G" Series
  • Component Locations 6.5L (VIN F) "C" & "K" Series
  • Component Locations 6.5L (VIN F) "G" Series
  • Component Locations 7.4L (VIN J) "G" Series