Posted in MMC L200

P2147 – Injector Common Circuit Earth Short Except MMC L200 IV

 Posted by  Posted on September 29, 2020

FUNCTION

  • The engine-ECU monitors voltage application to the injector during no injector energisation to detect errors in the injector drive circuit.

    • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position.
  • Except during the engine cranking period
  • Battery positive voltage is 8 V or more.
  • When an engine-ECU internal capacitor is allowed to be charged
  • Short-circuit to earth is detected in the injector drive circuit.

    • PROBABLE CAUSES

  • Failed injector
  • Short circuit in injector circuit or loose connector contact
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-41, A-42, A-129 and A-130 injector connectors

    Q. Are the check results normal?

    STEP 2. Check Injector itself

    Q. Is the check result normal?

    STEP 3. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 4. Check harness between C-105 (terminal No. 2) engine-ECU connector and A-42 (terminal No. 1) No. 1 injector connector.

  • Check earthing line for short circuit.

    • Q. Is the check result normal?

    STEP 5. Check harness between C-105 (terminal No. 75) engine-ECU connector and A-41 (terminal No. 1) No. 2 injector connector.

  • Check earthing line for short circuit.

    • Q. Is the check result normal?

    STEP 6. Check harness between C-105 (terminal No. 50) engine-ECU connector and A-130 (terminal No. 1) No. 3 injector connector.

  • Check earthing line for short circuit.

    • Q. Is the check result normal?

    STEP 7. Check harness between C-105 (terminal No. 27) engine-ECU connector and A-129 (terminal No. 1) No. 4 injector connector.

  • Check earthing line for short circuit.

    • Q. Is the check result normal?

    STEP 8. Check harness between C-105 (terminal No. 1) engine-ECU connector and A-42 (terminal No. 2) No. 1 injector connector.

  • Check power supply line for short circuit.

    • Q. Is the check result normal?

    STEP 9. Check harness between C-105 (terminal No. 25) engine-ECU connector and A-41 (terminal No. 2) No. 2 injector connector.

  • Check power supply line for short circuit.

    • Q. Is the check result normal?

    STEP 10. Check harness between C-105 (terminal No. 25) engine-ECU connector and A-130 (terminal No. 2) No. 3 injector connector.

  • Check power supply line for short circuit.

    • Q. Is the check result normal?

    STEP 11. Check harness between C-105 (terminal No. 1) engine-ECU connector and A-129 (terminal No. 2) No. 4 injector connector.

  • Check power supply line for short circuit.

    • Q. Is the check result normal?

    STEP 12. M.U.T.-III diagnosis code.

  • After erasing the diagnosis code through M.U.T.-III, start the engine and confirm whether the diagnosis code is set.

    • Q. Is the diagnosis code set?

    Author: admin