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 

etc.)

-- Remove the engine cover with air filter. Refer to the Repair Information.

-- Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical harness connector -8-.

Checking Internal Resistance 

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

Specified Value: 15.0 To 25.0 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 

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

-- Turn ignition switch ON.

Specified Value: 10.6 Volts +/- 2 Volts. 

If the specified value was Not obtained:

-- Leave the multimeter positive lead on terminal 1 and connect the multimeter negative lead to engine ground.

-- Ignition switch ON.

Specified value: Near battery voltage. 

If the specified value was Not obtained:

-- Remove fuse 24 in Fuse panel B. Check the wire from the electrical harness connector terminal 1 to fuse 24 in Fuse panel B 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 (GND) 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) -J623-. 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) -J623- electrical connector T60 terminal 32 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) -J623-. Refer to the Repair Information.

-- Install the engine cover with air filter. 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 .