EVAP System, Checking For Proper Seal

EVAP System, Checking For Proper Seal

Function Test
- Select the measuring value "Test ID 01: Tank leak test" and check whether specified value is attained, Diagnostic Mode 08 - Request Control of On-Board System, Test or Component Diagnostic mode 8: Tank leak test.
- Check specified value of tank leak test at idle.

Specification: 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 the specification is not obtained:

Checking for Leaks

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 right front wheel housing liner.
- Check the connection pipes 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 fuel delivery unit union nut is connected or if seal 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 ECM. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Generate Readiness Code