MULTIPORT Fuel Injection (MFI) - 3.0L - Symptom Procedures

• Symptom Procedures
  • INSPECTION PROCEDURE 1: Scan Tool Communication with ECM Is Not Possible
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 2: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position
    • Circuit Operation
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Remains Illuminated and Never Goes Out
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 4: Cranks, Won't Start
    • Cranks, Won't Start Circuit
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 5: Starts Up and Dies
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 6: Hard Starting
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 7: Unstable Idle (rough idle, hunting)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 8: Idle speed is high (improper idle speed)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 9: Idle Speed Is Low (improper idle speed)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 10: When the engine is cold, it stalls at idle (die out)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 11: When the Engine Is Hot, It Stalls at Idle (die out)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 12: The Engine Stalls when Accelerating (pass out)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 13: The engine stalls when decelerating
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 14: Hesitation, sag, stumble, Poor acceleration or Surge
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 15: Acceleration shock
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 16: Knocking
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 17: Too high CO and HC concentration when idling
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 18: Transient, Mass Emission Tailpipe Test Failure
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 19: Purge Flow Test of the Evaporative Emission Canister Failure
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 20: Pressure Test of the Evaporative System Failure
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 21: Power supply system and ignition switch - IG system
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
    • Diagnosis
  • INSPECTION PROCEDURE 22: Fuel pump system
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
    • Diagnosis
  • INSPECTION PROCEDURE 23: Ignition Switch-ST System and Transmission Range Switch System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 24: Ignition Circuit System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 25: A/C system
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • INSPECTION PROCEDURE 26: Engine oil pressure switch (for warning lamp) System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
    • Diagnosis