Evaporative Emission (EVAP) Canister System, Checking For Proper Seal

Evaporative Emission (EVAP) Canister System, Checking For Proper Seal

Function test
- Select the measuring value "Test-ID 01: Tank leak test" and check whether the specified value is being reached, 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 approx. 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 Proper Seal
If a small or large leak was recognized during the test of the EVAP canister system, proceed as follows.
- Remove right rear wheelhousing liner.
- Remove Leak detection pump (LDP) -V144- and seal connection piece to EVAP canister.
- 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 locking rings of the Fuel Pump (FP) are tightened or whether the sealing ring is leaking; replace if necessary.
- Repeat function test.

If malfunction persists:
- Remove EVAP canister and check for cracks and leaks, replace if necessary.
- Check lines and hoses between EVAP canister and fuel filler tube or Evaporative Emission (EVAP) Canister Purge Regulator Valve 1 and 2 for proper seal.
- 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), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code