EVAP Canister System, Checking For Proper Seal

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. 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 at idle for at least 15 minutes.


- End diagnostic 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 wheelhousing liner, rear left.
- Disconnect hose from diagnostic pump for fuel system at EVAP canister and seal it, Parts of the EVAP canister system, removing and installing.
- Repeat function test.

If malfunction persists:
- Check the connection lines and hoses between diagnostic pump for fuel system and EVAP canister for proper seal, Parts of the EVAP canister system, removing and installing.
- Repeat function test.

If malfunction persists:
- Check whether the fuel filler cap of fuel tank filler tube is completely closed or whether the seal leaks; replace if necessary.
- Check whether the locking ring of the Fuel Pump (FP) unit is tightened or whether the sealing ring is leaking; replace if necessary, Fuel Pump (FP) unit, removing and installing.
- Repeat function test.

If malfunction persists:
- Remove EVAP canister and check for cracks and leaks, replace if necessary, Parts of the EVAP canister system, 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.
- Disassembling and assembling fuel tank filler tube.
- Removing and installing parts of the EVAP canister system.

- 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.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes