EVAP Purge Regulator Valve, Checking

Special tools and workshop equipment 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 

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 Ω.

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 Ω 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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .