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

OPERATION

Controls the current that is applied from the engine-ECU connector terminals ETV+, ETV- to the electronic-controlled throttle valve connector terminals.

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.

or

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.

or

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

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. Check throttle valve control servo itself.

Electronic-controlled throttle valve control check.
Throttle valve control servo check (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. Perform resistance measurement at engine-ECU connector.

Disconnect connector, and measure at harness side.
Resistance between terminal RSG, RSH and body earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 3.

	Repair or replace the connector, or check and repair harness between engine-ECU connector terminal RSG, RSH and body earth. Check earthing line for open circuit and damage.

STEP 3. Check harness between electronic-controlled throttle valve connector terminal and engine-ECU connector terminal ETV+.

Check output line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 4.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 4. Check harness between electronic-controlled throttle valve connector terminal and engine-ECU connector terminal ETV-.

Check signal line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 5.

	Repair or replace the connector, or repair the damaged harness wire.

STEP 5. 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 ).