Signal Too High/Signal Too Low/Signal Missing

Signal too high/Signal too low/Signal missing

Checking the components and wiring

Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check the heated oxygen sensor (HO2S) pre-heating circuit. Measure the resistance between terminals #3 and #4 in the probe connector.

Note! If possible, measure from the rear of the affected connectors in order to minimize any damage and future loose connections.

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

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Checking wiring and terminals Checking Wiring and Terminals













Continue - 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 idle for at least 1 minute
- Test drive the car at an even speed (approximately 80 km/h for at least 5 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

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

-------------------------------------------------

Fault-tracing information

Attempt New Test - Checking the components and wiring

-------------------------------------------------