Evaporative Emission (EVAP) canister system, checking for proper seal
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen R32, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Function test
- Select the measuring value "Test-ID 01: Tank leak test" and check whether the specified value is being reached. Refer to Diagnostic mode 8: Tank leak test
- Check specified value of tank leak test at idle.
Specified value: Test function active
NOTE:
- During tank leak test, Engine Control Module (ECM) limits "test function active" to 12 minutes.
- If the accelerator pedal is depressed during the test, the test will be aborted.
- To repeat the tank leak test, switch ignition off and start engine again and let run 15 minutes at idle.
- End diagnosis and switch ignition off.
If a leak is detected:
Checking for proper seal
If a small or large leak was recognized during the test of the EVAP canister system, proceed as follows.
- Remove rear right wheelhousing liner.
- Disconnect hose or line from Leak Detection Pump (LDP) at the EVAP canister and seal it:
- Vehicles with engine code AFP. Refer to Parts of EVAP canister system (vehicles with engine code AFP), removing and installing ,
- Vehicles with engine code BDF. Refer to Parts of EVAP canister system (vehicles with engine code BDF), removing and installing ,
- Vehicles with engine code BJS. Refer to Parts of EVAP canister system (vehicles with engine code BJS), removing and installing .
- Repeat function test.
If malfunction persists:
- Check connecting pipes and hoses between Leak Detection Pump (LDP) and EVAP canister for proper seal:
- Vehicles with engine code AFP. Refer to Parts of EVAP canister system (vehicles with engine code AFP), removing and installing ,
- Vehicles with engine code BDF. Refer to Parts of EVAP canister system (vehicles with engine code BDF), removing and installing ,
- Vehicles with engine code BJS. Refer to Parts of EVAP canister system (vehicles with engine code BJS), removing and installing .
- Repeat function test.
If malfunction persists:
- Check whether the fuel filler cap is completely closed or whether the seal leaks, replace if necessary.
- Check whether the union nut of the Fuel Pump (FP) unit is tightened or whether the sealing ring is leaking; replace if necessary. Refer to Fuel Pump (FP) unit, removing and installing , Fuel Pump (FP) unit, removing and installing.
Vehicles with engine code BJS
- Check whether the union nut of Fuel Level Sensor 2 -G169- is tightened or whether the sealing ring is leaking; replace if necessary. Refer to Suction jet pumps (vehicles with engine code BJS), removing and installing , removing and installing suction jet pump.
Continuation for all vehicles
- Repeat function test.
If malfunction persists:
- Remove EVAP canister and check for tears and leaks, replace if necessary:
- Vehicles with engine code AFP. Refer to Parts of EVAP canister system (vehicles with engine code AFP), removing and installing ,
- Vehicles with engine code BDF. Refer to Parts of EVAP canister system (vehicles with engine code BDF), removing and installing ,
- Vehicles with engine code BJS. Refer to Parts of EVAP canister system (vehicles with engine code BJS), removing and installing .
- Check connecting pipes and hoses between EVAP canister and fuel flap unit or Evaporative Emission (EVAP) canister purge regulator valve 1 for proper seal:
- Vehicles with engine code AFP. Refer to Overview plan of EVAP canister system (vehicles with engine code AFP) ,
- Vehicles with engine code BDF. Refer to Overview plan of EVAP canister system (vehicles with engine code BDF) ,
- Vehicles with engine code BJS. Refer to Parts of EVAP canister system (vehicles with engine code BJS), removing and installing and. Refer to Parts of Leak Detection Pump -LDP- (vehicles with engine code BJS), removing and installing .
- Check hoses and hose clamps for secure seating.
- Repeat function test.
If malfunction is no longer present:
- Erase DTC memory of Engine Control Module (ECM). Refer to Diagnostic mode 4: Reset/erase diagnostic data
- Generate readiness code. Refer to Readiness code, generating