MULTIPORT Fuel Injection (MFI) - Symptom Procedures

• Symptom Procedures
  • INSPECTION PROCEDURE 1: Communication With PCM Only 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
    • Comment
    • 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 Or Stumble
    • 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: Deceleration Shock
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 17: Poor Acceleration
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 18: Surge
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 19: Knocking
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 20: Dieseling (Run-On)
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 21: Too High CO And HC Concentration When Idling
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 22: Transient, Mass Emission Tailpipe Test Failure
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 23: Purge Flow Test Of The Evaporative Emission Canister Failure
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 24: Pressure Test Of The Evaporative System Failure
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 25: Generator Output Voltage Is Low (Approximately 12.3 Volts)
    • Notes
    • Circuit Operation
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Charging System:)
    • Diagnosis
  • INSPECTION PROCEDURE 26: Fans (Radiator Fan, A/C Condenser Fan) Are Inoperative
    • Notes
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Code To Be Set Are:)
    • Diagnosis
  • INSPECTION PROCEDURE 27: Power Supply System And Ignition Switch-IG System
    • Notes
    • Circuit Operation
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Code To Be Set Are:)
    • Diagnosis
  • INSPECTION PROCEDURE 28: Fuel Pump System
    • Notes
    • Circuit Operation
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Code To Be Set Are:)
    • Diagnosis
  • INSPECTION PROCEDURE 29: Ignition Switch-ST System And Transmission Range Switch System
    • Notes
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Caused For This Code To Be Set Are:)
    • Diagnosis
  • INSPECTION PROCEDURE 30: Ignition Circuit System
    • Notes
    • Circuit Operation
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis
  • INSPECTION PROCEDURE 31: A/C System
    • Notes
    • Comment
    • TROUBLESHOOTING HINTS (The Most Likely Causes For This Case:)
    • Diagnosis