Faulty Signal

Faulty signal

Checking the components and wiring
Visually check that the rear heated oxygen sensors (HO2S) have not been mounted in the wrong bank on banks 1 and 2.
Read off the voltage of the probe on the rear heated oxygen sensor (HO2S) for bank 1.
Read off the voltage of the probe on the rear heated oxygen sensor (HO2S) for bank 2.

Hint: If the voltage is constantly close to 0 V on one bank and 1 V on the other bank, or vice-versa, the rear heated oxygen sensors (HO2S) have been switched.

Try new heated oxygen sensors (HO2S) if the above fault-tracing does not remedy the fault.
Remedy as necessary.

Other information
- Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- Checking wiring and terminals Checking Wiring And Terminals














Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine. Allow the engine to run at idle speed for 10 minutes
- Connect VCT2000 to the data link connector (DLC) without switching off the engine.

Note! If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated.

Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list.
Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.





Is the function 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the components and wiring

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