Posted in MMC L200

P2118 – Throttle Valve Control (DC Motor) Current Malfunction MMC L200 IV

 Posted by  Posted on September 29, 2020

OPERATION

  • Current supplied from the engine-ECU (terminal No. 129 and No. 114) to the throttle valve control servo (terminal No. 5 and No. 6) is adjusted.

    • FUNCTION

  • The throttle valve control servo drive IC in the engine-ECU monitors current flowing in the throttle control servo and cuts energisation if it detects overcurrent.

    • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position.
  • An overcurrent cut-off signal from the throttle valve control servo drive integrated circuit (IC) is repeatedly detected for 0.5 second.

    • PROBABLE CAUSES

  • Failed throttle control servo
  • Short circuit in throttle valve control servo circuit or loose connector contact
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-132 electronic-controlled throttle valve connector.

    Q. Is the check result normal?

    STEP 2. Check throttle valve control servo itself

    Q. Is the check result normal?

    STEP 3. Connector check: C-103 engine-ECU connector.

    Q. Is the check result normal?

    STEP 4. Check harness between C-103 (terminal No. 114) engine-ECU connector and A-132 (terminal No. 6) electronic-controlled throttle valve connector.

  • Check output line for short circuit.

    • Q. Is the check result normal?

    STEP 5. Check harness between C-103 (terminal No. 129) engine-ECU connector and A-132 (terminal No. 5) electronic-controlled throttle valve connector.

  • Check output line for short circuit.

    • Q. Is the check result normal?

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

  • After clearing 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