Engine Control System & Fuel System - Diagnosis & Troubleshooting

• 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
  • Diagnostic Aids
  • Test Description
• Malfunction Indicator Lamp (MIL) Always On
  • Circuit Description
  • Diagnostic Aids
  • Test Description
• Engine Cranks but Does Not Run
  • Circuit Description
  • Diagnostic Aids
  • Test Description
• Ignition Relay Diagnosis
  • Circuit Description
  • Diagnostic Aids
    • Notes
    • Test Description
• Fuel Pump Electrical Circuit Diagnosis
  • Circuit Description
  • Diagnostic Aids
    • Notes
    • Test Description
• Fuel System Diagnosis
  • System Description
  • Test Description
• Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)
  • Notes
  • Test Description
• Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F)
  • Notes
  • Test Description
• Fuel Injector Balance Test with Special Tool
  • Notes
  • Test Description
• Fuel Injector Circuit Diagnosis
  • Circuit Description
  • Diagnostic Aids
  • Test Description
• Fuel Tank Leak Test
• Alcohol/Contaminants-in-Fuel Diagnosis
  • Notes
  • Testing Procedure
• Evaporative Emission Control System Diagnosis
  • EVAP Canister Inspection
  • EVAP Canister Vacuum Leak Pump Assembly Inspection
    • Notes
    • EVAP Canister Purge Valve Inspection
• Electronic Ignition (EI) System Diagnosis
  • Circuit Description
  • Diagnostic Aids
  • Test Description
• Crankcase Ventilation System Inspection/Diagnosis
• Inspection/Maintenance (I/M) System Check
  • Description
  • Conditions for Updating the I/M System Status
  • Monitored Emission Control Systems
  • Diagnostic Aids
  • Test Description
• 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
    • Notes
    • Test Description
• Inspection/Maintenance Evaporative Emission System Set
  • Description
  • Conditions for Running
  • Diagnostic Aids
    • Notes
    • Test Description
• Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set
  • Description
  • Conditions for Running
  • Diagnostic Aids
    • Notes
    • Test Description
• Service Bay Test
  • Notes
  • EVAP Service Bay Test
  • Check Mode