Code No. P1210: Throttle Valve Solenoid Malfunction <Vehicles without intercooler>

OPERATION

Power is supplied the throttle solenoid valve connector terminal from the engine control relay connector terminal.
The engine-ECU connector terminal TH switches on the power transistor in the unit, and current flows into the throttle solenoid valve connector terminal.

FUNCTION

The throttle solenoid valve opens and closes the throttle valve based on the signal from the engine-ECU.

TROUBLE JUDGEMENT

Check Conditions

Ignition switch: OFF
The barometric is pressure is 95.4 kPa or more (equivalent to the barometric pressure at an altitude of 500m).

Judgement Criterion

The manifold pressure sensor output is not changed.

PROBABLE CAUSES

Failed throttle solenoid valve
Failed throttle actuator
Failed EGR valve
Open/short circuit in throttle solenoid valve circuit or loose connector contact
Faulty vacuum hose or vacuum pipe
Faulty vacuum pump
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check throttle solenoid valve itself

Check throttle solenoid valve itself (Refer to ).

Q. Is the check result normal?

	Go to Step 2.

	Replace the throttle solenoid valve.

STEP 2. Check throttle actuator itself

Check throttle actuator itself (Refer to ).

Q. Is the check result normal?

	Go to Step 3.

	Replace the throttle actuator.

STEP 3. Perform voltage measurement at throttle solenoid valve connector.

Disconnect connector, and measurement at harness side.
Ignition switch: ON
Voltage between terminal power supply line and body earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 5.

	Go to Step 4.

STEP 4. Check harness between throttle solenoid valve connector terminal and engine control relay connector terminal.

Check power supply line for open/short circuit.

Q. Is the check result normal?

	Go to Step 5.

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

STEP 5. Perform voltage measurement at engine-ECU connector.

Measure engine-ECU terminal voltage.
Ignition switch: ON
Voltage between terminal TH and body earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 7.

	Go to Step 6.

STEP 6. Check harness between engine-ECU connector terminal TH and throttle solenoid valve connector terminal.

Check output line for open/short circuit.

Q. Is the check result normal?

	Go to Step 7.

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

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

Reconfirmation of diagnosis code

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 ).