EVAP Canister Purge Valve 1, Checking

EVAP Canister Purge Valve 1, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SC5) 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).

Test procedure

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

Start diagnosis

- Remove the rear engine cover - arrows -.





- Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical harness connector - 2 -.





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.





- Crank the engine.

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 theEngine 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 ] Service and Repair.

- Using a Multimeter, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) electrical connector terminal 2 to theEngine Control Module (ECM) (J623) electrical connector T94 terminal 9 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 ] Service and Repair.

Assembly is performed in the reverse order of removal.

Final procedures

After 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 Mode 03 - Read DTC Memory.

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

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

- End of diagnosis.

- End diagnosis and switch the ignition off.