Symptom Troubleshooting [Engine Control System)
- Symptom Troubleshooting Wiring Diagram
- Foreword
- Intermittent Concern Troubleshooting
- Engine Symptom Troubleshooting
- Quick Diagnostic Chart
- No. 1 Melting Of Main Or Other Fuses
- No. 2 Mil Illuminates
- No. 3 Will Not Crank
- No. 4 Hard To 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 Is Always On Or A/C Compressor Runs Continuously
- No. 25 A/C Is Not Cut Off Under Wide Open Throttle Conditions
- No. 26 Exhaust Sulphur Smell
- No. 27 Fuel Refill Concerns
- No. 28 Fuel Filling Shut Off Concerns
- No. 29 Spark Plug Condition
- Engine Control System Operation Inspection
- Input Signal System Inspection Procedure
- Notes
- Finding irregular signals
- Locating the source of unusual signals
- Variable resistance type 1 (TP sensor and EGR boost sensor)
- Input signal system inspection for variable resistance type 1
- Standard power supply system inspection for variable resistance type 1
- GND system inspection for variable resistance type 1
- Variable resistance type 2 (mass air flow (MAF) sensor and VSS)
- GND system inspection for variable resistance type 2
- Input signal system inspection for variable resistance type 2
- Electrical supply system inspection for variable resistance type 2
- 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
- Electronic Throttle Control System 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
- Evaporative Emission (EVAP) System Leak Inspection
- EVAP system leak inspection using WDS or equivalent
- Evaporative system test procedure
- EVAP system leak inspection using leak tester
- Input Signal System Inspection Procedure