Flow Fault, Permanent

Flow fault, Permanent

Checking fuel tank pressure sensor




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

Hint: Fuel tank pressure must be higher than -1000 Pa. The normal value is approximately 0 Pa.





Is the fuel tank pressure OK?

Yes - Checking canister purge (CP) valve

No - Verification

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Checking canister purge (CP) valve




- Disconnect hose between canister purge (CP) valve and EVAP canister from the canister purge (CP) valve.
- Start the engine and let it idle.
Read off canister purge (CP) valve pulse signal.
There should not be vacuum in the canister purge (CP) valve when the pulse signal is 0%.

Other information
- Location of components see Location of components, only B52X4 T Locations.
- To access/replace the canister purge (CP) valve, see Replacing the canister purge (CP) valve Service and Repair.





Is the value correct?

Yes - Checking hoses

No - Verification

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Checking hoses
Check that EVAP canister shut-off valve is not blocked.
Check that EVAP canister shut-off valve filter is not blocked.
Check hose between EVAP canister and EVAP canister shut-off valve and hose between EVAP canister shut-off valve and filter for blockage or restriction.
Check EVAP canister shut-off valve terminal in EVAP canister for blockage.
Remedy as necessary.





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 - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing 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 fuel tank pressure sensor

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