Operation CHARM: Car repair manuals for everyone.

Evaporative Purge Regulator Valve, Checking







Evaporative Purge Regulator Valve, Checking

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, refer to the applicable wiring diagram.

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.

Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) is supplied via the Motronic Engine Control Module (ECM) Power Supply Relay (J271).

Test procedure

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

Start diagnosis

- Remove the engine cover with air filter. Refer to appropriate service manual.





- Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical harness connector - 1 -.





Checking internal resistance

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





Specified value: 22.0 to 30.0 ohms.

If the specified value is not obtained:

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

If the specification is obtained:

Checking voltage supply

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





- Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained:

- Using a multimeter, check the electrical harness connector terminal 1 for voltage.










- Operate the starter briefly.

Specified value: battery voltage.

If the specified value is not obtained:

- Check the wiring connection from the electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay (J271) terminal 2/87 for 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:

Check Ground (GND) activation

- Using a multimeter, check the electrical harness connector for voltage.










- Operate the starter briefly.

Specified value: battery voltage.

- Switch the ignition off.

If the specified value was not obtained:

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) (J623). Refer to appropriate service manual.

- Using a multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical connector terminal 2 to Motronic Engine Control Module (ECM) (J623) electrical connector T60 for an open circuit.










Specified value: 1.5 ohms max.

If the specification is not obtained:

- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

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

- If necessary, repair the wiring connection.

If the specification was obtained:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service manual.

- Install the engine cover with air filter. Refer to appropriate service manual.

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 ] Readiness Code.