EVAP Purge Regulator Valve, Checking

Diagnostic Procedures

EVAP Purge Regulator Valve, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) fuse OK.

• The ignition switched OFF.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical harness connector.

Checking internal resistance

- Using a multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) terminals 1 and 2 for resistance.





Specified value: 14 to 25 ohms.

If the specified value was Not obtained:

- Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80).

If the specification is obtained:

Checking voltage supply

- Star the engine.

- Using a multimeter, check the purge valve electrical harness connector terminal 1 to 2 for voltage.





Specified value: 10.6 volts +/- 2 volts.

Turn the ignition switch OFF.

If the specified value was Not obtained:

- Leave the multimeter positive lead on terminal 1 and connect the multimeter negative lead to engine ground.

- Engine still running.

Specified value: 10.6 volts +/- 2 volts.

Turn the ignition switch OFF.

If the specified value was Not obtained:

- Remove fuse S-243. Check the wire from the electrical harness connector terminal 1 to fuse S-243 for open or high resistance.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If the specified value was obtained:

Check Ground activation

If the manufacturers test box is being used, perform the following step.

- Install the test box.

If the manufacturers test box is not being used, perform the following step.

- Remove the Motronic Engine Control Module (ECM) ( J220). Refer to the Repair Information.

- Using a multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical connector terminal 2 to Motronic Engine Control Module (ECM) (J220 ) electrical connector T121 terminal 64 for an open circuit.





Specified value: 1.5 ohms max.

If the specified value was Not obtained:

- Check the wiring for a short to voltage, high resistance or an open circuit.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection.

If the specified value was obtained:

- Replace the Motronic Engine Control Module (ECM) (J220). Refer to the Repair Information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.