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. 2).
The engine-ECU (terminal No. 64) 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 measures the surge voltage of the variable induction control solenoid coil.
The engine-ECU drives the variable induction control solenoid. After the solenoid is turned off, the engine-ECU will check if the solenoid coil produces a surge voltage (battery positive voltage +2 V).

TROUBLE JUDGMENT

Check Conditions

More than 1 second have elapsed from previous monitoring.
Battery positive voltage is more than 11 V and is less than 16.5 V.
More than 1 second have passed since the engine starting sequence was completed.
Variable induction control solenoid valve continues to be ON for 1 second or longer.

Judgment Criterion

The variable induction control solenoid coil surge voltage is not detected for 1 second after the variable induction control solenoid is turned OFF.

PROBABLE CAUSES

Failed variable induction control solenoid valve
Open/short circuit or harness damage in variable induction control solenoid valve circuit or loose connector contact
Failed engine-ECU

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-134 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-134 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-134 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: A-33X engine control relay connector

Q. Is the check result normal?

	Check intermediate connector A-13, and repair if necessary. If intermediate connector is normal, check and repair harness between B-134 (terminal No. 1) variable induction control solenoid valve connector and A-33X (terminal No. 2) engine control relay connector. Check power supply line for open/short circuit.

	Repair or replace the connector.

STEP 6. Connector check: B-29 engine-ECU connector

Q. Is the check result normal?

	Go to Step 7 .

	Repair or replace the connector.

STEP 7. Check harness between B-134 (terminal No. 2) variable induction control solenoid valve connector and B-29 (terminal No. 64) engine-ECU connector.

Check output line for open/short circuit and damage.

Q. Is the check result normal?

	Go to Step 8 .

	Repair the damaged harness wire.

STEP 8. Check harness between B-134 (terminal No. 1) variable induction control solenoid valve connector and A-33X (terminal No. 2) engine control relay connector.

note

Before checking harness, check intermediate connector A-13, and repair if necessary.

Check power supply line for damage.

Q. Is the check result normal?

	Go to Step 9 .

	Repair the damaged harness wire.

STEP 9. 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.