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 GENERAL DIAGNOSIS .

Start diagnosis

-- 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 Motronic Engine Control Module (ECM) Power Supply Relay -J271- terminal 2/87 for an open circuit according to wiring diagram.

If the specified value 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 specified value was obtained:

Check Ground (GND) activation

-- Using a Multimeter --, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical harness connector to Battery positive (+) for voltage.

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- Electrical Harness connector Terminal	Measure to
2	Battery positive (+)

-- Operate the starter briefly.

Specified value: battery voltage.

-- Switch the ignition off.

If the specified value was not obtained:

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

-- Install the test box. Refer to Repair information.

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

-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .

-- Using a Multimeter --, check the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- electrical connector terminal 2 to the Motronic Engine Control Module (ECM) -J220- electrical connector T121 terminal 64 for an open circuit.

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- Electrical harness connector terminal	Motronic Engine Control Module (ECM) -J220- or Test box socket
2	64

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 Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .

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.