EVAP Canister 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 

-- Remove the engine cover with air filter.

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

Checking internal resistance 

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

Specified value: 22, 0 to 30, 0 Ω.

If the specified value is 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 for voltage.

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical harness connector terminal	Measure to
1	Engine Ground (GND)

-- Operate the starter briefly.

Specified value: battery voltage.

If the specified value is 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, short circuit to each other, Battery (+), and 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:

Checking wiring 

If the manufacturers test box is being used. Perform the following step.

-- Install the Test Box 105 Pin VAG1598/42.

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 .

-- 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 5 for resistance.

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical harness connector terminal	Motronic Engine Control Module (ECM) -J623- electrical connector T60 terminal test box socket
2	5

Specified value: 1.5 Ω max.

If the specification is not obtained:

-- Check the wiring for an open circuit, short circuit to each other, Battery (+), and Ground (GND).

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

-- If necessary, repair the wiring connection.

If no malfunction is found in wiring:

-- 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:

Repair complete, Generate readiness code. Refer to READINESS CODE .

-- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REMOVING AND INSTALLING .

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 .