WOMS
P code powertrain High severity

P1351 IDM Input Circuit Malfunction/ Ignition Coil Control Circuit High Voltage

The OBD2 code P1351 indicates a malfunction in the IDM (Injector Driver Module) input circuit or a high voltage condition in the ignition coil control circuit, which can affect engine performance and fuel injection...

Definition

The OBD2 code P1351 indicates a malfunction in the IDM (Injector Driver Module) input circuit or a high voltage condition in the ignition coil control circuit, which can affect engine performance and fuel injection timing

Common causes

  • Faulty Ignition Coil
  • Faulty IDM (Injector Driver Module)
  • Wiring issues (shorts or open circuits)
  • Poor connections or corroded terminals
  • Faulty PCM (Powertrain Control Module)
  • Grounding issues
  • Faulty sensors (e.g., crankshaft or camshaft position sensors)
  • Voltage supply issues

Common misdiagnoses

  • Faulty ignition coil
  • Bad spark plugs
  • Ignition control module failure
  • Wiring issues or shorts in the circuit
  • Faulty PCM (Powertrain Control Module)
  • Fuel system problems
  • Vacuum leaks
  • Timing issues
  • Crankshaft or camshaft position sensor failure
  • Battery or charging system issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the ignition coils and the IDM. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harness for any fraying or breaks

  4. 4. Test the Ignition Coils

    Use a multimeter to test the resistance of the ignition coils. Compare the readings to the manufacturer’s specifications

  5. 5. If any coils are out of spec, they may need to be replaced

  6. 6. Check the IDM

    Test the Ignition Driver Module (IDM) for proper operation. This may involve checking the power and ground connections to the IDM

  7. 7. If the IDM is faulty, it may need to be replaced

  8. 8. Inspect the PCM (Powertrain Control Module)

    Check for any issues with the PCM, as it controls the ignition system. Ensure that it is receiving the correct signals and is functioning properly

  9. 9. If necessary, reflash or replace the PCM

  10. 10. Test for Short Circuits

    Use a multimeter to check for short circuits in the ignition coil circuit. This includes checking for continuity between the ignition coil wires and ground

  11. 11. Check for Open Circuits

    Ensure that there are no open circuits in the ignition coil control circuit. This can be done by testing the continuity of the wires from the PCM to the ignition coils

  12. 12. Inspect the Fuses

    Check the fuses related to the ignition system. A blown fuse can cause a loss of power to the ignition coils

  13. 13. Perform a Visual Inspection of the Engine

    Look for any signs of mechanical issues that could affect the ignition system, such as vacuum leaks or issues with the fuel system

  14. 14. Clear the Code and Test Drive

    After performing the necessary repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1

  15. 15. Consult Repair Manual

    If the issue persists, consult the vehicle’s repair manual for specific diagnostic procedures and specifications related to the ignition system.1

  16. 16. Seek Professional Help

    If you are unable to resolve the issue, consider seeking help from a professional mechanic or automotive technician who has experience with ignition system diagnostics. By following these steps, you should be able to identify and resolve the underlying issue causing the P1351 code