Engine Control System 3.4L (Troubleshooting & Diagnosis)

• Diagnostic Information & Procedures
  • Symptoms - Engine Controls
    • Important Preliminary Checks Before Starting
    • Visual/Physical Check
  • Intermittent Conditions
  • Hard Start
  • Surges/Chuggles
  • Lack of Power, Sluggishness, or Sponginess
  • Detonation/Spark Knock
  • Hesitation, Sag, Stumble
  • Cuts Out, Misses
  • Poor Fuel Economy
  • Poor Fuel Fill Quality
  • Rough, Unstable, or Incorrect Idle and Stalling
  • Dieseling, Run-On
  • Backfire
  • Malfunction Indicator Lamp (MIL) Inoperative
    • Circuit Description
    • MIL Operation
    • Test Description
  • Malfunction Indicator Lamp (MIL) Always On
    • Circuit Description
    • MIL Operation
    • Diagnostic Aids
    • Test Description
  • Engine Cranks but Does Not Run
    • Circuit Description
    • Test Description
  • Ignition Relay Diagnosis
    • Circuit Description
  • Fuel Pump Electrical Circuit Diagnosis
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Fuel System Diagnosis
    • System Description
    • Test Description
  • Fuel Injector Coil Test
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Fuel Injector Balance Test with Special Tool
    • Notes
    • System Description
      • Notes
      • Test Description
  • Fuel Injector Balance Test with Tech 2
    • Circuit Description
      • Notes
      • Test Description
  • Fuel Injector Circuit Diagnosis
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Fuel Tank Leak Test
    • Description
    • Diagnostic Aids
    • Test Description
  • Alcohol/Contaminants-in-Fuel Diagnosis (With Special Tool)
    • Description
    • Test Procedure
  • Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)
    • Notes
    • Alcohol in Fuel Testing Procedure
    • Particulate Contaminants in Fuel Testing Procedure
  • Manifold Absolute Pressure (MAP) Sensor Diagnosis
    • Circuit Description
    • Test Description
  • Idle Air Control (IAC) System Diagnosis
    • Circuit Description
    • Diagnostic Aids
    • Test Description
  • Electronic Ignition (EI) System Diagnosis
    • Circuit Description
  • Crankshaft Position Sensor (CKP) System Diagnosis
    • Circuit Description
  • Inspection/Maintenance (I/M) System Check
    • Description
    • Conditions for Updating the I/M System Status
    • Monitored Emission Control Systems
  • Inspection/Maintenance (I/M) Complete System Set Procedure
    • Description
    • Conditions for Running
    • Diagnostic Aids
    • Test Description
  • Inspection/Maintenance (I/M) System DTC Table
  • Inspection/Maintenance (I/M) Catalyst System Set Procedure
    • Description
    • Conditions for Running
    • Diagnostic Aids
  • Inspection/Maintenance (I/M) Exhaust Gas Recirculation (EGR) System Set Procedure
    • Description
    • Conditions for Running
    • Diagnostic Aids
  • Inspection/Maintenance (I/M) Evaporative Emission (EVAP) System Set Procedure
    • Description
    • Conditions for Running
    • Diagnostic Aids
  • Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure
    • Description
    • Conditions for Running
    • Diagnostic Aids
  • Inspection/Maintenance (I/M) Heated Oxygen Sensor (HO2S) Heater System Set Procedure
    • Description
    • Conditions for Running
    • Diagnostic Aids
  • Service Bay Test
    • Description
    • Conditions for Running the Test
    • Test Procedure