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 Conditions
  • Battery positive voltage is more than 8.3 V.
  • Difference between the throttle position sensor (main) output voltage and the target throttle position sensor (main) voltage is more than 0.1 V.
  • Difference between the throttle position sensor (sub) output voltage and the target throttle position sensor (sub) voltage is more than 0.1 V.
  • The drive duty of the throttle valve control servo is more than 100 %.
  • Except while engine is being cranked.


  • Battery positive voltage is more than 8.3 V.
  • Difference between the target throttle position sensor (main) voltage and the throttle position sensor (main) output voltage is more than 0.1 V.
  • Difference between the target throttle position sensor (sub) voltage and the throttle position sensor (sub) output voltage is more than 0.1 V.
  • The drive duty of the throttle valve control servo is more than 100 %.
  • Except while engine is being cranked.
Judgement Criterion
  • Difference between the throttle position sensor (main) output voltage and the learning value of the middle-opened degree is less than 0.2 V.


  • Difference between the throttle position sensor (sub) output voltage and the learning value of the middle-opened degree is less than 0.2 V.

PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-20 electronic-controlled throttle valve connector

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

STEP 2. Perform resistance measurement at B-20 electronic-controlled throttle valve connector.

  • Disconnect connector, and measure at electronic-controlled throttle valve side.
  • Resistance between terminal No. 1 and No. 2.
OK: 0.3 - 100 kΩ (at 20 °C)

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

STEP 3. Connector check: B-29 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-30 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 .
Repair the damaged harness wire.

STEP 5. Check harness between B-20 (terminal No. 1) electronic-controlled throttle valve connector and B-29 (terminal No. 15) engine-ECU connector.

  • Check output line for short circuit and damage.

Q. Is the check result normal?
Go to Step 6 .
Repair the damaged harness wire.

STEP 6. Check harness between B-20 (terminal No. 2) electronic-controlled throttle valve connector and B-29 (terminal No. 16) engine-ECU connector.

  • Check output line for short circuit and damage.

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

STEP 7. 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 ).