MULTIPORT Fuel Injection (MFI) - Symptom Procedures

• Symptom Procedures
  • Inspection Procedure 1: 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) < M/T >
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 9: Idle Speed Is Low (Improper Idle Speed) < CVT >
    • 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: Dieseling (Run-On)
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 18: Too High Co And HC Concentration When Idling
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 19: Transient, Mass Emission Tailpipe Test Failure
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 20: Purge Flow Test Of The Evaporative Emission Canister Failure
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 21: Pressure Test Of The Evaporative System Failure
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 22: 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 23: Fuel Pump System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
    • Diagnosis
  • Inspection Procedure 24: Ignition Switch-St System And Starter Relay System < M/T >
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 25: Ignition Switch-St System And Starter Relay System < CVT >
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 26: Ignition Circuit System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 27: A/C System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis
  • Inspection Procedure 28: Engine Oil Pressure Switch System
    • Notes
    • Circuit Operation
    • Comment
    • TROUBLESHOOTING HINTS (The most likely causes for this case:)
    • Diagnosis