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-A/T-ECU (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



  • The variable induction control solenoid valve changes the pressure, intorduced into the vacuum actuator, to the barometric pressure and the vaccum pressure of the vacuum tank.

TROUBLE JUDGMENT


Check Conditions
  • While engine is being cranked.
  • Battery voltage is 10 - 16 V.
Judgment Criterion
  • The variable induction control solenoid coil surge voltage (system voltage +2 V) is not detected for a second.

PROBABLE CAUSES



  • Failed variable induction control solenoid valve
  • Open/short circuit in variable induction control solenoid value circuit or loose connector contact
  • Failed engine-A/T-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-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 supply line for open/short circuit.
Repair or replace the connector.

STEP 6. Perform voltage measurement at D-212 engine-A/T-ECU 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-212 engine-A/T-ECU 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-212 (terminal No. 4) engine-A/T-ECU connector.

    • Check output line for open/short circuit.
Repair or replace the connector.

STEP 8. Connector check: D-212 engine-A/T-ECU 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-212 (terminal No. 4) engine-A/T-ECU connector.

  • Check output line for damage.

Q. Is the check result normal?
Go to Step 10 .
Repair the damaged harness wire.

STEP 10. Connector check: B-15X engine control relay connector

Q. Is the check result normal?
Go to Step 11 .
Repair or replace the connector.

STEP 11. 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 12 .
Repair the damaged harness wire.

STEP 12. 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-A/T-ECU.