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



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?

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