Symptom Troubleshooting [Engine Control System]

• Symptom Troubleshooting Wiring Diagram
• Foreword
• Symptom Diagnostic Index
• 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
• Intermittent Concern Troubleshooting
  • Vibration Method
  • 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
  • Finding Irregular Signals
  • Locating The Source Of Unusual Signals
  • Variable Resistance Type T (TP Sensor and APP Sensor)
  • Input Signal System Inspection for Variable Resistance Type 1
  • Standard Power Supply System Inspection for Variable Resistance Type 1
  • Ground System Inspection for Variable Resistance Type 1
  • Variable Resistance Type 2 (MAF Sensor)
  • Ground 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
  • Ground System Inspection for Thermistor Type
  • Main Relay Operation Inspection
  • Intake Manifold Vacuum Inspection
  • Electronic Throttle 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
  • Evaporative Emission (EVAP) System Leak Inspection
  • EVAP System Leak Inspection Using M-MDS
  • Evaporative System Test Procedure
  • EVAP System Leak Inspection Using Leak Tester