Code No. P0660: Variable Induction Control Solenoid Valve System

OPERATION

Power is supplied to the variable induction control solenoid valve (terminal No. 1) from the engine control relay (terminal No. 1).
The engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 4) makes the power transistor in the unit be in ON position, and that makes currents go on the variable induction control solenoid valve (terminal No. 2).

FUNCTION

To judge if there is open circuit in the variable induction control solenoid drive circuit, engine-ECU <M/T> or engine-A/T-ECU <A/T> measures the surge voltage of the variable induction control solenoid coil.
The engine-ECU <M/T> or engine-A/T-ECU <A/T> drives the variable induction control solenoid. After the solenoid is turned off, the engine-ECU <M/T> or engine-A/T-ECU <A/T> will check if the solenoid coil produces a surge voltage (battery positive voltage +2 volts).

TROUBLE JUDGMENT

Check Conditions

Ignition switch is in ON position.
Battery positive voltage is 10 - 16 V.

Judgment Criterion

The surge voltage (system voltage +2 V) of solenoid coil is not detected when the variable induction control solenoid valve is turned in OFF position from ON.

PROBABLE CAUSES

Failed variable induction control solenoid valve
Open/short circuit in variable induction control solenoid value circuit or loose connector contact
Failed engine-ECU <M/T> or engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

Item 21: variable induction control solenoid valve

OK: Operating sound can be heard and the valve vibrates

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Go to Step 2 .

STEP 2. Connector check: B-10 variable induction control solenoid valve connector

Q. Is the check result normal?

	Go to Step 3 .

	Repair or replace the connector.

STEP 3. Perform resistance measurement at B-10 variable induction control solenoid valve connector.

Disconnect connector, and measure at solenoid valve side.
Resistance between terminal No. 1 and No. 2.

OK: 29 - 35 Ω (at 20°C)

Q. Is the check result normal?

	Go to Step 4 .

	Replace the variable induction control solenoid valve.

STEP 4. Perform voltage measurement at B-10 variable induction control solenoid valve connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 1 and earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 6 .

	Go to Step 5 .

STEP 5. Connector check: B-15X engine control relay connector

Q. Is the check result normal?

	Check and repair harness between B-10 (terminal No. 1) variable induction control solenoid valve connector and B-15X (terminal No. 1) engine control relay connector. Check power line for open/short circuit.

	Repair or replace the connector.

STEP 6. Perform voltage measurement at D-243 engine-ECU <M/T> connector or D-212 engine-A/T-ECU <A/T> connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 4 and earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 8 .

	Go to Step 7 .

STEP 7. Connector check: D-243 engine-ECU <M/T> connector or D-212 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Check and repair harness between B-10 (terminal No. 2) variable induction control solenoid valve connector and D-243 (terminal No. 4) engine-ECU <M/T> connector or D-212 (terminal No. 4) engine-A/T-ECU <A/T> connector. Check output line for open/short circuit.

	Repair or replace the connector.

STEP 8. Connector check: D-243 engine-ECU <M/T> connector or D-212 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 9 .

	Repair or replace the connector.

STEP 9. Check harness between B-10 (terminal No. 2) variable induction control solenoid valve connector and D-243 (terminal No. 4) engine-ECU <M/T> connector or D-212 (terminal No. 4) engine-A/T-ECU <A/T> connector.

Check output line for damage.

Q. Is the check result normal?

	Go to Step 10 .

	Repair the damaged harness wire.

STEP 10. Check harness between B-10 (terminal No. 1) variable induction control solenoid valve connector and B-15X (terminal No. 1) engine control relay connector.

Check power line for damage.

Q. Is the check result normal?

	Go to Step 11 .

	Repair the damaged harness wire.

STEP 11. M.U.T.-III actuator test

Item 21: variable induction control solenoid valve

OK: Operating sound can be heard and the valve vibrates

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

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