Inspection Procedure 27: 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. 2).

FUNCTION

In response to the 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 inlet manifold.

PROBABLE CAUSE

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 08: 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 ).

	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.

STEP 3. Check purge control solenoid valve itself.

Check purge control solenoid valve itself [Refer to GROUP 17 - Emission Control System - Evaporative Emission Control System - Purge Control Solenoid Valve Check ]

Q. Is the check result normal?

	Go to Step 4 .

	Replace 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 power line for open/short circuit.

Repair or replace.

STEP 6. Connector check: C-110 engine-A/T-ECU connector

Q. Is the check result normal?

Go to Step 7 .

Repair or replace.

STEP 7. Perform voltage measurement at C-110 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 .

Check output line for open circuit.

STEP 8. Check harness between B-01 (terminal No. 1) purge control solenoid valve connector and C-110 (terminal No. 23) engine-A/T-ECU connector.

Check earthing line for damage.

Q. Is the check result normal?

Go to Step 9 .

Repair.

STEP 9. 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 10 .

Repair.

STEP 10. M.U.T.-III actuator test

Item 08: 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 ).

	Replace engine-A/T-ECU.