Faulty Signal, Permanent Fault

Faulty signal, permanent fault

Checking the connector








- Ignition off
- Check the fuel tank pressure sensor connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault Check for damage carefully.
- Assemble the connector
- Start the engine
Read off the fuel tank pressure.
The fuel tank pressure should be approximately 0 hPa when the fuel tank filler cap is open

Other information
- For specifications see Component specifications [1][2]Engine Control Module.
- For information about signals, see Signal specification Signal Specifications.













Is the fuel tank pressure OK?

Yes - FAULT FOUND

No - Checking the wiring

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Checking the wiring
Check the signal cable between control module terminal B31 (#B41) and fuel tank pressure sensor connector terminal 2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the signal cable between control module terminal B31 (#B41) and fuel tank pressure sensor connector terminal 2 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the power cable between control module terminal B10 (#B20) and fuel tank pressure sensor connector terminal 3 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: Use a test screwdriver with at least a 3W bulb to determine if the cable is short-circuited to supply voltage

Other information
- Connecting the breakout box / accessing the control module, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- For information about signals, see Signal specification Signal Specifications.














Continue - Verification

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Verification




Verification

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








- Ignition off.
- Reconnect connectors, reinstall components.
- Start the engine.
Read off fuel tank pressure.
The fuel tank pressure should be approximately 0 hPa (0 psi) when the fuel tank filler cap is open.





Is the fuel tank pressure 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 the connector

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