Code No. P2100: Throttle Valve Control Servo Circuit (open)


OPERATION



  • Controls the current that is applied from the engine-ECU (terminals No. 15, No. 16) to the electronic-controlled throttle valve (terminals No. 1, No. 2).

FUNCTION



  • Engine-ECU varies the direction and the amperage of the current that is applied to the throttle valve control servo in order to control the opening of the throttle valve.

TROUBLE JUDGMENT


Check Condition
  • Battery positive voltage is more than 8.3 V.
Judgement Criteria
  • The proposed output voltage subtracted from the output voltage of the throttle position sensor (main/sub) equals 0.1 V or higher.
  • The learning value at the middle-opened degree subtracted from the output voltage of the throttle position sensor (main/sub) equals 0.2 V or lower.
  • Although the driving signal of the throttle valve control servo is output, the throttle valve control servo is not driven.

FAIL-SAFE AND BACKUP FUNCTION



  • Throttle opening degree position is in default position.

PROBABLE CAUSES



  • Failed throttle valve control servo.
  • Open circuit or harness damage in throttle valve control servo circuit or lose connector contact.
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-12 electronic-controlled throttle valve connector

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

STEP 2. Check throttle valve control servo itself.

  • Throttle valve control servo check (Refer to ).

Q. Is the check result normal?
Go to Step 3 .
Replace the throttle body assembly.

STEP 3. Connector check: B-27 engine-ECU connector

Q. Is the check result normal?

Go to Step 4 .
Repair or replace the connector.

STEP 4. Perform resistance measurement at B-27 engine-ECU connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 71, No. 83 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 5 .

    Check and repair harness between B-27 (terminal No. 71, No. 83) engine-ECU connector and body earth.

    • Check earthing line for open circuit and damage.

STEP 5. Connector check: B-26 engine-ECU connector

Q. Is the check result normal?

Go to Step 6 .
Repair or replace the connector.

STEP 6. Check harness between B-12 (terminal No. 1) electronic-controlled throttle valve connector and B-26 (terminal No. 15) engine-ECU connector.

  • Check output line for open circuit and damage.

Q. Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire.

STEP 7. Check harness between B-12 (terminal No. 2) electronic-controlled throttle valve connector and B-26 (terminal No. 16) engine-ECU connector.

  • Check output line for open circuit and damage.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 8. M.U.T-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is 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 ).