P2146 – Injector Common 1 (cylinder No. 1 and No. 4) Circuit Open MMC L200 IV

FUNCTION

  • The engine-ECU monitors peak current from the No. 1 and No. 4 injector drive circuits.

  • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position.
  • Except during the engine cranking period
  • Battery positive voltage is 8 V or more.
  • When the peak current is not detected in injector circuits No. 1 and No. 4

  • PROBABLE CAUSES

  • Failed No. 1 injector
  • Failed No. 4 injector
  • Open/short circuit in No. 1 and No. 4 injector circuit or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-42 No. 1 injector connector and A-129 No. 4 injector connector

    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. 1) engine-ECU connector and A-42 (terminal No. 2) No. 1 injector connector.

  • Check power supply line for open/short circuit.
  • Q. Is the check result normal?

    STEP 5. Check harness between C-105 (terminal No. 25) engine-ECU connector and A-129 (terminal No. 2) No. 4 injector connector.

  • Check power supply line for open/short circuit.
  • Q. Is the check result normal?

    STEP 6. 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 open/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 open circuit.
  • Q. Is the check result normal?

    STEP 8. 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?

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