Canister Purge Solenoid: Testing and Inspection

PURGE SOLENOID VALVE INSPECTION [L3]

Evaporative Purge Control Inspection
Without using WDS or equivalent

1. Warm up the engine and idle it.
2. Disconnect the vacuum hose which is connected to the charcoal canister from purge solenoid valve.




3. Place your finger onto the evaporative hose as shown in the figure and verify that vacuum is applied.
- If vacuum is not applied, inspect the following:
- PCM output signal circuit (wiring harness, connector)
- Evaporative purge control signal
- Purge solenoid valve

4. Run the vehicle on the chassis dynamometer and maintain the engine speed at approx. 2,000 rpm.
5. Verify that vacuum is applied after approx. 30 seconds.
- If the vacuum is not verified, inspect the following:
- PCM input signal circuit (sensor, switch, wiring harness)
- Intake air temperature signal (IAT sensor)
- Evaporative purge control signal (purge solenoid valve)
- Throttle opening signal (TP sensor)
- Load/no load identification signal Neutral switch/CPP switch (MTX)/TR switch (ATX)
- Purge solenoid valve

Using WDS or equivalent




1. Connect the WDS or equivalent to the DLC-2.
2. Warm up the engine and idle it.
3. Using the "EVAPCP" simulation function, set the present 0% duty value of the purge solenoid valve to the 100% duty value and verify that the engine idles roughly or stalls.
- If the idle status does not change, inspect the following:

1. Turn the ignition switch to the ON position.
2. Using the "EVAPCP" simulation function, set the present 0% duty value of the purge solenoid valve to the 50% duty value and verify purge solenoid valve operation sound.
- If the operation sound is verified, inspect the following:
- Purge solenoid valve airflow
- Disconnection and damage of the vacuum hose (intake manifold-purge solenoid valve-charcoal canister)

- If the operation sound is not verified, inspect the following:
- Purge solenoid valve airflow
- Wiring harness and connector open circuit (main relay-purge solenoid valve-PCM)

Airflow Inspection

1. Remove the purge solenoid valve without disconnecting the evaporative hose.







2. Verify that the airflow is as indicated in the table.
- If as specified in the table, perform the "Circuit Open/Short Inspection".
- If not as specified in the table, inspect the purge solenoid valve.

Circuit Open/Short Inspection

1. Disconnect the PCM connector.




2. Inspect the following wiring harnesses for open or short circuit (continuity check).

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Purge solenoid valve terminal A and PCM terminal 2AN
- Purge solenoid valve terminal B and main relay terminal C

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Purge solenoid valve terminal A and body ground
- Purge solenoid valve terminal A and power supply
- Purge solenoid valve terminal B and body ground