Code No. P2118: Throttle Valve Control DC Motor Current Malfunction


OPERATION



  • Current supplied from the engine-ECU connector terminal ETV- and ETV+ to the throttle valve control servo connector terminal 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


Check Condition
  • Ignition switch is in "ON" position.
Judgment Criterion
  • An overcurrent cut-off signal from the throttle valve control servo drive integrated circuit (IC) is repeatedly detected.

FAIL-SAFE AND BACKUP FUNCTION



  • The throttle valve is opened (Electrical discontinuity).
  • The EGR control is stopped (fully closed).
  • The DPF regeneration is prohibited.
  • The AS&G control is prohibited.

PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. Check throttle valve control servo itself

  • Throttle body assembly connector check.
  • Check throttle valve control servo itself (Refer to ).

Q. Is the check result normal?
Go to Step 2.
Repair or replace the connector, or replace the throttle body assembly.

STEP 2. Check harness between engine-ECU connector terminal ETV+ and throttle body assembly connector terminal.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 3. Check harness between engine-ECU connector terminal ETV- and throttle body assembly connector terminal.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 4.
Repair or replace the connector, or repair the damaged harness wire.

STEP 4. 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?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).