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. 4).
The engine-ECU controls the purge control solenoid valve by turning the power transistor in the engine-ECU.

FUNCTION

In response to a signal from the engine-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 positive voltage is 10 V or higher.

Judgment Criterion

The surge voltage of solenoid coil is not detected when the purge control solenoid valve is turned in OFF position from ON.

PROBABLE CAUSES

Failed purge control solenoid valve
Open/short circuit and damage in purge control solenoid value circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

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

Item No. 6: 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: A-107 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 A-107 purge control solenoid valve connector.

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

OK: 30 - 34 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 A-107 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-206 engine control relay connector

Q. Is the check result normal?

Check power supply line for open/short circuit.

Repair or replace the connector.

STEP 6. Perform voltage measurement at A-34 engine-ECU connector.

Disconnect connector, and measure at harness side.
Ignition switch: ON
Voltage between terminal No. 38 and earth.

OK: System voltage

Q. Is the check result normal?

Go to Step 8 .

Go to Step 7 .

STEP 7. Connector check: A-34 engine-ECU connector

Q. Is the check result normal?

Check earthing line for open/short circuit.

Repair or replace the connector.

STEP 8. Connector check: A-34 engine-ECU connector

Q. Is the check result normal?

Go to Step 9 .

Repair or replace the connector.

STEP 9. Check harness between A-107 (terminal No. 1) purge control solenoid valve connector and A-34 (terminal No. 38) engine-ECU connector.

Check earthing line for damage.

Q. Is the check result normal?

Go to Step 10 .

Repair the damaged harness wire.

STEP 10. Check harness between A-107 (terminal No. 2) purge control solenoid valve connector and B-206 (terminal No. 4) engine control relay connector.

note

Before checking harness, check intermediate connector A-36 and B-212, and repair if necessary.

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 No. 6: 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-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).