VW EVAP Canister Purge Valve Diagnosis
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VW EVAP Canister Purge Valve Diagnosis

Performing a function test and vacuum check are essential for proper diagnosis and avoiding any unnecessary replacements.

Models

All Models (Except Routan) 2007-2017

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Description

One or more of the following fault codes may be stored in the ECM Fault Memory:

• P043E, P043F, P0440, P0441, P0442, P0443, P0444, P0445, P0447, P0448, P0449, P0455, P0456, P0457, P0458, P0459, P0496.

Performing a function test and vacuum check on the Canister Purge Valve -N80- are essential for proper diagnosis and avoiding any unnecessary replacements.

1. Using VCDS, perform the Guided Fault Finding test plan for the Canister Purge Valve -N80- by following the on-screen prompts.

2. When the test starts, the -N80- Canister Purge Valve will be activated via the output diagnosis test mode, listen and/or feel for an audible “click” sound coming from the -N80- purge valve. The audible “click” sound may be heard easier if the vehicle hood is open.

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a. If audible “click” noise is heard, the -N80- Activated Charcoal Filter System Solenoid Valve is operational, and a vacuum check must be performed to verify if the valve is sealing properly.

b. If audible “click” noise is not heard, this bulletin does not apply, continue Guided Fault Finding based diagnosis.

3. Disconnect the -N80- purge valve from the engine. Attach the VAS6213 Vacuum/Pressure pump to the engine side of the valve (side flow indicator on valve points to) and apply approximately -0.6 Bar (-450 mmHg) of vacuum.

a. Proper installation of the vacuum pump on the Canister Purge Valve -N80- is essential (Photo 2).

  4. If the valve holds vacuum, DO NOT replace it. Continue with normal diagnosis.

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