Code No. P0443: Purge Control Solenoid Valve System










OPERATION



  • Power is supplied to the purge control solenoid valve (terminal No. 2) from the engine control relay (terminal No. 1).
  • The engine-A/T-ECU (terminal No. 23) makes the power transistor in the unit be in ON position, and that makes currents go on the purge control solenoid valve (terminal No. 1).

FUNCTION



  • In response to a signal from the engine-A/T-ECU, the purge control solenoid valve controls the flow rate of the purge air to be introduced into the surge tank.

TROUBLE JUDGMENT


Check Conditions
  • Ignition switch is in "ON" position.
  • Battery voltage is more than 10 V.
Judgment Criterion
  • The purge control solenoid coil surge voltage (system voltage +2 V) is not detected when the purge control solenoid valve is turned in OFF from ON.

PROBABLE CAUSES



  • Failed purge control solenoid valve
  • Open/short circuit in purge control solenoid value circuit or loose connector contact
  • Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

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

  • Item 10: Purge 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-01 purge 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-01 purge control solenoid valve connector.

  • Disconnect connector, and measure at solenoid valve side.
  • Resistance between terminal No. 1 and No. 2.
OK: 22 - 26 Ω (at 20°C)

Q. Is the check result normal?
Go to Step 4 .
Replace the purge control solenoid valve.

STEP 4. Perform voltage measurement at B-01 purge control solenoid valve connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 2 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-01 (terminal No. 2) purge 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. 23 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-01 (terminal No. 1) purge control solenoid valve connector and D-212 (terminal No. 23) 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-01 (terminal No. 1) purge control solenoid valve connector and D-212 (terminal No. 23) 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-01 (terminal No. 2) purge control solenoid valve connector and B-15X (terminal No. 1) engine control relay connector.

  • Check power supply 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 10: purge 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.