P0202 – No. 2 Injector Circuit Malfunction Euro5b MMC L200 IV



OPERATION

  • Driving power is supplied from the engine-ECU (terminal No. 73) to the No. 2 injector (terminal No. 2).
  • The engine-ECU (terminal No. 75) turn on the power transistor to flow current to the No. 2 injector (terminal No. 1).

  • FUNCTION

  • The engine-ECU monitors peak current during injector drive control to detect disconnection in the injector No. 2 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. 2 injector circuit is not detected, the circuit is judged to be open.

  • PROBABLE CAUSES

  • Failed No. 2 injector
  • Open/short circuit or harness damage in No. 2 injector circuit or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-41 No. 2 injector connector

    Q. Is the check result normal?

    STEP 2. Check No. 2 injector itself.

    Q. Is the check result normal?

    STEP 3. Check harness between No. 2 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-41 (terminal No. 2) No. 2 injector connector and C-105 (terminal No. 73) 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?

    Author: admin