Signal Missing

Signal missing

Checking the components and wiring
Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.
Check the resistance of the heated oxygen sensor (HO2S) between terminals #1 and #2.
Check the signal cable between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A49 (#A49). Check the power supply between system relay terminal #3 and heated oxygen sensor (HO2S) terminal #1. Check for an open-circuit.
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Component specifications, B5254T7 [1][2]Engine Control Module
- Oxygen sensor (Catalyst monitor sensor), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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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
- Run the engine at idle speed for at least 1 minute.
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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the components and wiring

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