Engine Controls - 2.0L (L34 GMDAT) - Symptom Troubleshooting And Diagnosis

• Symptoms - Engine Controls
  • Important Preliminary Checks Before Starting
• 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
    • Notes
    • MIL Function
    • MIL Illumination
  • Test Description
• Malfunction Indicator Lamp (MIL) Always On
  • Circuit Description
  • MIL Operation
    • Notes
    • MIL Function
    • MIL Illumination
  • Test Description
• Engine Cranks But Does Not Run
  • Description
  • Diagnostic Aids
  • Test Description
• Main Relay Circuit Diagnosis
  • Circuit Description
  • Diagnostic Aids
• Fuel System Diagnosis
  • Circuit Description
  • Test Description
• Fuel Pump Electrical Circuit Diagnosis
  • Circuit Description
  • Diagnostic Aids
  • Test Description
• Fuel Injector Solenoid Coil Test
  • Circuit Description
  • Diagnostic Aids
• Fuel Injector Circuit Diagnosis
  • Circuit Description
  • Diagnostic Aids
• Fuel Injector Balance Test with Special Tool
  • System Description
  • Test Description
• Fuel Tank Leak Test
  • Description
  • Diagnostic Aids
  • Test Description
• Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool)
  • Description
  • Alcohol in Fuel Testing Procedure
  • Particulate Contaminants in Fuel Testing Procedure
• Alcohol/Contaminants-in-Fuel Diagnosis (w/Special Tool)
  • Description
  • Test Procedure
• Idle Air Control (IAC) System Diagnosis
  • Circuit Description
  • IAC Valve Reset
  • Diagnostic Aids
• Electronic Ignition System Diagnosis
  • Circuit Description
  • Test Description
• Crankcase Ventilation System Inspection/Diagnosis
  • Inspection Procedure
• Inspection/Maintenance System Check
  • Description
  • Conditions for Updating the I/M System Status
  • Monitored Emission Control Systems
  • Diagnostic Aids
  • Test Description
• Inspection/Maintenance Complete System Set Procedure
  • Description
  • Conditions for Running
  • Diagnostic Aids
  • Test Description
• Inspection/Maintenance (I/M) Test DTC Table
• Inspection/Maintenance (I/M) Catalyst System Set Procedure
  • Description
  • Conditions for Running
  • Diagnostic Aids
  • Test Description
• Inspection/Maintenance (I/M) Exhaust Gas Recirculation (EGR) System Set Procedure
  • Description
  • Conditions for Running
  • Diagnostic Aids
• Inspection/Maintenance Evaporative Emission System Set
  • Description
  • Conditions for Running
  • Diagnostic Aids
  • Test Description
• Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set
  • Description
  • Conditions for Running
  • Diagnostic Aids
  • Test Description
• Inspection/Maintenance Heated Oxygen Sensor Heater System Set
  • Description
  • Conditions for Running
  • Diagnostic Aids
  • Test Description