Symptom Troubleshooting (LF, L3)

• Symptom Troubleshooting Wiring Diagram
• Foreword
• Engine Symptom Troubleshooting
• Quick Diagnostic Chart
• No.1 Melting Of Main Or Other Fuses
• No.2 Mil 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/Detonation-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 Does 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
      • Notes
      • Variable resistance type 1 (TP sensor and EGR boost sensor)
        • Notes
        • 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)
        • Notes
        • 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)
        • Notes
        • 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
    • Engine coolant temperature compensation inspection
    • Load compensation inspection
    • Engine speed
    • Throttle position (TP) sweep 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 Pan 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 M-MDS
      • Notes
      • EVAP system test description
      • EVAP system malfunction judgment
      • Evaporative system test procedure
    • EVAP system leak inspection using leak tester