Code No. P1122: Throttle Valve Control Servo Connector System

OPERATION

The electric current from the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 133 and No. 141) to the throttle valve control servo (terminal No. 1 and No. 2) is controlled.
The engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 144 and No. 145) earths the voltage applied on the throttle valve control servo to the vehicle body.

FUNCTION

The engine-ECU <M/T> or engine-A/T-ECU <A/T> controls the throttle valve-opened degree by varying the direction and the amount in the electric current going through the servo coil.

TROUBLE JUDGMENT

Check Conditions

Battery voltage is 8.3 V or more.
Ignition switch is in ON position.

Judgment Criterion

The drive current of the throttle valve control servo is not normal.

PROBABLE CAUSE

Failed throttle valve control servo
Open/short circuit in throttle valve control servo circuit or loose connector contact
Failed engine-ECU <M/T>
Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-06 electronic-controlled throttle valve connector

Q. Is the check result normal?

Go to Step 2 .

Repair or replace.

STEP 2. Check throttle valve control servo

Check throttle valve control servo (Refer to ).

Q. Is the check result normal?

	Go to Step 3 .

	Replace throttle body assembly.

STEP 3. Connector check: C-114 engine-ECU <M/T> connector or engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

Go to Step 4 .

Repair or replace.

STEP 4. Perform resistance measurement at C-114 engine-ECU <M/T> connector or engine-A/T-ECU <A/T> connector.

Disconnect connector, and measure at harness side.
Resistance between terminal No. 144 and earth, also between terminal No. 145 and earth.

OK: 2 Ω or less

Q. Is the check result normal?

Go to Step 5 .

Check earthing line for open circuit and damage.

STEP 5. Check harness between B-06 (terminal No. 2) electronic-controlled throttle valve connector and C-114 (terminal No. 141) engine-ECU <M/T> connector or engine-A/T-ECU <A/T> connector.

Check output line for open circuit and damage.

Q. Is the check result normal?

Go to Step 6 .

Repair.

STEP 6. Check harness between B-06 (terminal No. 1) electronic-controlled throttle valve connector and C-114 (terminal No. 133) engine-ECU <M/T> connector or engine-A/T-ECU <A/T> connector.

Check output line for open circuit and damage.

Q. Is the check result normal?

Go to Step 7 .

Repair.

STEP 7. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

	Replace engine-ECU <M/T> or engine-A/T-ECU <A/T>.

	Intermittent malfunction (Refer to GROUP 00 - Hoe to Use Troubleshooting/Inspection Service Points ).