Symptom Troubleshooting (Engine Control System AJ)
- Control System Device And Control Relationship Chart
- Foreword
- Intermittent Concern Troubleshooting
- Symptom Diagnostic Index
- Symptom Quick Diagnostic Chart
- No. 1 Melting Of Main Or Other Fuses
- No. 2 Mil Illuminates
- No. 3 Will Not Crank
- No. 4 Hard Start/Long Crank/Erratic Start/Erratic Crank
- No. 5 Engine Stalls -- After Start/At Idle
- No. 6 Cranks Normally But Will Not Start
- No. 7 Slow Return To Idle
- No. 8 Engine Runs Rough/Rolling Idle
- No. 9 Fast Idle/Runs On
- No. 10 Low Idle/Stalls During Deceleration
- No. 11 Engine Stalls/Quits, Engine Runs Rough, Misses, Buck/Jerk, Hesitation/Stumble, Surges
- No. 12 Lack/Loss Of Power -- Acceleration/Cruise
- No. 13 Knocking/Pinging -- Acceleration/Cruise
- No. 14 Poor Fuel Economy
- No. 15 Emission Compliance
- No. 16 High Oil Consumption/Leakage
- No. 17 Cooling System Concerns-Overheating
- No. 18 Cooling System Concerns -- Runs Cold
- No. 19 Exhaust Smoke
- No. 20 Fuel Odor (In Engine Compartment)
- No. 21 Engine Noise
- No. 22 Vibration Concerns (Engine)
- No. 23 A/C Does Not Work Sufficiently
- No. 24 A/C Always On/A/C Compressor Runs Continuously
- No. 25 A/C Does Not Cut Off Under Wide Open Throttle Conditions
- No. 26 Exhaust Sulphur Smell
- No. 27 Fuel Refill Concerns
- No. 28 Fuel Filling Shut Off Issues
- No. 29 Spark Plug Condition
- Engine Control System Operation Inspection
- Input Signal System Investigation Procedure
- Notes
- Finding unusual signals
- Locating the source of unusual signals
- Variable resistance type 1 (APP sensor, TP sensor and EGR boost sensor)
- Investigate the input signal system for variable resistance type 1
- Investigate the standard power supply system for variable resistance type 1
- Investigate the GND system for variable resistance type 1
- Variable resistance type 2 (MAF sensor)
- Investigate the GND system for variable resistance type 2
- Investigate the input signal system for variable resistance type 2
- Investigate the electrical supply system for variable resistance type 2
- Thermistor type (IAT sensor and ECT sensor)
- Investigate the input signal system for thermistor type
- Investigate the GND system for thermistor type
- Main Relay Operation Inspection
- Intake Manifold Vacuum Inspection
- Electronic Throttle Control Inspection
- Fuel Injector Operation Inspection
- Fuel Cut Control System Inspection
- Fuel Pump Operation Inspection
- Fuel Pump Control System Inspection
- Ignition Timing Control Inspection
- Spark Test
- EGR Control System Inspection
- Purge Control System Inspection
- A/C Cut-off Control System Inspection
- Variable Air Duct (VAD) Control System Operation Inspection
- Evaporative Emission (EVAP) System Leak Inspection
- EVAP system leak inspection using WDS or equivalent
- Input Signal System Investigation Procedure