Flow Fault, Permanent

Flow fault, Permanent

Checking the tank pressure sensor




- Open the filler cap.
- Start the engine and let it remain idle.
Read the tank pressure.

Hint: The tank pressure must be greater than -10 hPa. The normal value is close to 0 hPa.





Is the tank pressure OK?

Yes - Checking the EVAP valve

No - Verification

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Checking the EVAP valve




- Remove the hose that runs between the EVAP valve and the canister from the EVAP valve.
- Start the engine and let it remain idle.
Read the EVAP valve pulse signal.
When the pulse signal is 0%, there must not be any vacuum in the EVAP valve.

Additional information
- For location of components, B52X4 T, see Location of components Locations.
- For location of components, B6304 S, see Location of components Locations.
- For location of components, B6284 T, see Location of components Locations.





Is the value correct?

Yes - Checking the hoses

No - Verification

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Checking the hoses
Check that the canister valve is not sealed.
Check that the canister valve filter is not sealed.
Check the hose between the canister and canister valve and the hose between the canister valve and its filter for blockage and clamping.
Check the canister valve's connection to the canister for blockage.
Do the necessary corrective action.
- To access/replace the canister valve, see Replacing the shut-off valve for the carbon filter container Service and Repair.

Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Start the engine.
Activate the quick fuel tank system test.





Is the value OK?

Yes - Verification completed

No - Trouble-shooting information

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Trouble-shooting information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the tank pressure sensor

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