Symptom Troubleshooting - Engine

• Foreword
• Engine Control System Symptom Diagnostic Index
  • Notes
  • Diagnostic Index
• Engine Control System Device And Control Relationship Table
• Quick Diagnostic Table
• No. 1 Blown Fuses
• No. 2 Check Engine Light Illuminates
  • Notes
  • Diagnostic Procedure
• No. 3 Will Not Crank
  • Notes
  • Diagnostic Procedure
• No. 4 Hard To 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 Is Always On Or A/C Compressor Runs Continuously
  • Notes
  • Diagnostic Procedure
• No. 25 A/C Is 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 Concerns
  • Notes
  • Diagnostic Procedure
• No. 29 Spark Plug Condition
  • Notes
  • Diagnostic Procedure
• Intermittent Concern Troubleshooting
  • Vibration Method
    • Notes
    • Inspection Method for Switch Connectors or Wiring Harnesses
    • Inspection Method for Sensor Connectors or Wiring Harnesses
    • Inspection Method for Sensors
    • Inspection Method for Actuators or Relays
  • Water Sprinkling Method
• Engine Control System Operation Inspection
  • Input Signal System Inspection Procedure
    • Notes
    • Finding Irregular Signals
    • Locating the Source Of Unusual Signals
    • Thermistor Type (IAT Sensor and ECT Sensor)
    • Input Signal System Inspection For Thermistor Type
    • GND System Inspection For Thermistor Type
  • Main Relay Operation Inspection
  • Intake Manifold Vacuum Inspection
  • Drive-by-wire Control System Inspection
    • Engine Coolant Temperature Compensation Inspection
    • Load Compensation Inspection
    • Throttle Position (TP) Sweep Inspection
    • Brake Override System Operation Inspection
  • Variable Intake Air Control Operation Inspection
  • Variable Tumble Control Operation Inspection
  • Fuel Injector Operation Inspection
  • Fuel Cut Control System Inspection
  • Fuel Pump Operation Inspection
  • Fuel Pump Control System Inspection
  • Spark Test
  • EGR Control System Inspection
  • Purge Control System Inspection
  • A/C Cut-off Control System Inspection
  • Cooling Fan Control System Inspection
  • Variable Valve Timing Control System Operation Inspection
    • When Idling Cannot Be Continued
    • When Idling Can Be Continued
  • Evaporative Emission (EVAP) System Leak Inspection
    • Notes
    • EVAP system leak inspection using the M-MDS
    • EVAP System Leak Inspection Using Leak Tester