EVAP Canister System Sealing, Checking

EVAP canister system sealing, checking

Function test

- Select the measuring value "Test-ID 01: Tank leak test" and check whether the specified value is being reached.

- Check specified value of tank leak test at idle.

Specified value: Test OK

Note:
- The function test can take a few 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 at idle.

- End diagnosis and switch ignition off.

If specified value is not obtained:

Checking Proper Seal

If a small or large leak was recognized during the test of the EVAP canister system, proceed as follows.

- Disconnect hose from diagnostic pump for fuel system at EVAP canister and seal it.

- Repeat function test.

If malfunction persists:

- Remove wheelhouse liner, rear left.

- Check the connection lines and hoses between diagnostic pump for fuel system and EVAP canister for proper seal.

- 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.

- Repeat function test.

If malfunction persists:

- Remove EVAP canister and check for cracks and leaks, replace if necessary.

- Check connecting lines and hoses between EVAP canister and fuel flap unit or Evaporative Emission (EVAP) Canister Purge Regulator Valve.

- 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).

- Generate readiness code.