EVAP Canister Purge Regulator Valve, Checking

EVAP Canister Purge Regulator Valve, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SA5) OK.

• The ignition switched off.

• Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) is supplied by the Engine Component Power Supply Relay (J757).

Procedure

- Remove the rear engine cover - arrows -.





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





Checking internal resistance

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





Specified value: 22,0 to 30,0 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

- 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 to Ground (GND) for voltage.





- Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained:

- Check the wiring connection from the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical harness connector terminal 1 to the Engine Component Power Supply Relay (J757) terminal 2/87 for an open circuit or short to ground (GND).

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

- If necessary, repair the wiring connection.

If the specified value was obtained:

Checking wiring

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 => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

- Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical connector terminal 2 to the Engine Control Module (ECM) (J623) electrical connector T60a terminal 5 for an open circuit.









Specified value: 1.5 ohms.

If the specification was not obtained:

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

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

- If necessary, repair the wiring connection.

If the specification was obtained:

- Replace the Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

Assembly is performed in the reverse order of removal.

Final procedures

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

1. Check the DTC memory.

2. If necessary, erase the DTC memory.

3. If the DTC memory was erased, generate readiness code.

- End diagnosis and switch the ignition off.