Canister Purge Control Valve: Testing and Inspection

EVAP Canister Purge Regulator Valve Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SB6) OK.

• The ignition switched off.

Test procedure

- Observe safety precautions. Refer to => [ Safety Precautions ] Safety Precautions

- Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] Clean Working Conditions

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

Start diagnosis

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

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

Checking internal resistance

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

Specified value: 22,0 to 30,0 ohms.

If the specified value was not obtained:

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

If the specification is obtained:

Checking voltage supply

- Start the engine.

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





Specified value: Battery voltage.

If the specified value was not obtained:

- Check the wiring connection from the EVAP Canister Purge Regulator Valve (N80) electrical harness connector terminal 1 to fuse 8 in Fuse Panel B for high resistance, an open circuit or a short circuit to Ground (GND).

- 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)

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 the Repair Information.

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










Specified value: 1.5 ohms.

If the specified value is not obtained:

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

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

- If necessary, repair the wiring connection.

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

If the DTC does return, no malfunction is detected in the wiring and the voltage supply is OK:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to the Repair Information.

- Assembly is performed in the reverse of the removal.

Final procedures

After repair work, the following work steps must be performed in the mentioned 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.