EVAP Canister Purge Regulator Valve, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test Requirements 

• Fuses -SA15 - and -SA18- OK.
• Engine Component Power Supply Relay -J757- OK.
• The ignition switched off.

Test Procedure 

-- Perform a preliminary check to verify the customer's complaint. Refer to PRELIMINARY CHECK .

-- Remove the rear engine cover -arrows-.

-- Disconnect the electrical harness connector -3- from the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.

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 to 30 Ω

If the specified value is not obtained:

-- Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Refer to Component Locations Overview

If the specification is obtained:

Checking voltage supply

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

-- Operate the starter briefly.

Specified value: battery voltage

If the specified value was not obtained:

-- Using a Multimeter --, check the electrical harness connector terminal 1 to Engine Ground (GND) for voltage.

Harness connector Terminal	Measure to
1	Engine Ground (GND)

-- Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained again:

-- Check the wiring connection from the electrical harness connector terminal 1 to the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 3 for an open circuit according to wiring diagram.

Specified value: 1.5 Ω

-- If necessary, repair the wiring connection.

If the voltage supply is OK:

Check Ground (GND) activation

-- Using a Multimeter --, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical connector terminal 2 to B+

Harness connector Terminal	Measure to
2	B+

-- Operate the starter briefly.

Specified value: battery voltage

-- Switch the ignition off.

If the specified value is not obtained:

If the manufacturers test box is being used, perform the following step.

-- Install the test box VAG1598/42. Refer to Component Locations Overview .

If the manufacturers test box is not being used, perform the following step.

-- Remove the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

-- Using a Multimeter --, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical connector terminal 2 to theEngine Control Module (ECM) -J623- electrical harness connector terminal 49 for resistance.

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- Electrical harness connector terminal	Engine Control Module (ECM) -J623- electrical harness connector terminal
2	49

Specified value: Wire resistance max 1.5 Ω

If the specification was not obtained:

-- Check the wiring for a short circuit to Battery positive (+), Ground (GND) or an open circuit.

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

-- If necessary, repair the wiring connection.

-- If the wiring is OK, replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

If the specification was obtained:

-- 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.

-- Assembly is performed in the reverse of the removal.

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 .