EVAP Canister Purge Regulator Valve Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse -SB6- OK.
• The ignition switched off.

Test procedure 

-- Observe safety precautions. Refer to SAFETY PRECAUTIONS 

-- Observe Clean Working Conditions. Refer to CLEAN WORKING CONDITIONS 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- 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 Ω.

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.

EVAP Canister Purge Regulator Valve -N80- Electrical harness connector terminal	Motronic Engine Control Module (ECM) -J623- or Test box socket T60
2	5

Specified value: 1.5 Ω.

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 .

-- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to READINESS CODE .

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 .
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 .