EVAP Canister Purge Regulator Valve, Checking
EVAP Canister Purge Regulator Valve, Checking
Special tools, testers and auxiliary items required
• Multimeter.
• Wiring diagram.
Test requirements
• Fuses (SA15)and (SA18) OK.
• Engine Component Power Supply Relay (J757) OK.
• The ignition switched off.
• Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) is supplied through the the Engine Component Power Supply Relay (J757).
Test procedure
- Perform a preliminary check to verify the customer's complaint. Refer to => [ Preliminary Check ] 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 ohms
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 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.
- 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 ohms
- 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+
- 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).
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 ] Engine Control Module, Replacing.
- 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 harness connector terminal 49 for resistance.
Specified value: Wire resistance max 1.5 ohms
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 ] Engine Control Module, Replacing.
If the specification was obtained:
- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] 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 ] Monitors, Trips, Drive Cycles and Readiness Codes.
- 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 ] Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.