Posted in MMC L200

P0201 – No. 1 Injector Circuit Malfunction MMC L200 IV

 Posted by  Posted on September 28, 2020

OPERATION

  • Driving power is supplied from the engine-ECU (terminal No. 1) to the No. 1 injector (terminal No. 2).
  • The engine-ECU (terminal No. 2) turn on the power transistor to flow current to the No. 1 injector (terminal No. 1).

    • FUNCTION

  • The engine-ECU monitors peak current during injector drive control to detect disconnection in the injector No. 1 circuit.

    • TROUBLE JUDGMENT

  • Ignition switch is in ON position
  • Battery positive voltage is 8 V or more.
  • Except during the engine cranking period
  • When an engine-ECU internal capacitor is allowed to be charged
  • When the peak current of the No. 1 injector circuit is not detected, the circuit is judged to be open.

    • PROBABLE CAUSES

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

    • DIAGNOSIS PROCEDURE

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

    Q. Is the check result normal?

    STEP 2. Check No. 1 injector itself.

    Q. Is the check result normal?

    STEP 3. Check harness between No. 1 injector connector and engine-ECU connector.

  • Check earthing line for open/short circuit and damage.

    • Q. Are the check results normal?

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

  • Check power supply line for open/short circuit and damage.

    • Q. Is the check result normal?

    STEP 5. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 6. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

    • Q. Is the diagnosis code set?

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