EVAP Canister Purge Regulator Valve, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse -SA5- OK.
• The ignition switched off.

Procedure 

-- Remove the rear engine cover -arrows-.

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

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, 0 to 30, 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 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 Ground (GND) 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 was 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 or short to ground (GND).

-- Check the electrical harness connector for damage, corrosion, lose 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. .

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 the Engine Control Module (ECM) -J623- electrical connector T60a terminal 5 for an open circuit.

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- Electrical harness connector terminal	Motronic Engine Control Module (ECM) -J623- electrical connector T60a terminal or test box socket
2	5

Specified value: 1.5 Ω.

If the specification was not obtained:

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

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

-- If necessary, repair the wiring connection.

If the specification was obtained:

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

Assembly is performed in the reverse order of removal.

Final procedures 

After repair work, the following work steps must be performed in the mentioned sequence:

1. Check the DTC memory..
2. If necessary, erase the DTC memory..
3. If the DTC memory was erased, generate readiness code..

-- End diagnosis and switch the ignition off.