Fault-Tracing

Fault-tracing

Checking the status




- Start the engine and allow it to idle for 5 minutes.
Check whether the fault is permanent or intermittent. Read off the diagnostic trouble code (DTC) fault status when the diagnostic status is "Completed".
The fault is permanent if the fault status is "Fault found". If the status is "No fault found" this indicates that the fault is intermittent.









Continue - Checking components

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Checking components

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

Check the connector for the rear heated oxygen sensor (bank 2) for contact resistance and oxidation.
Check the cable between Engine Control Module (ECM) #A40 (#A40) and heated oxygen sensor #4 for contact resistance and oxidation in connections, open circuit and short-circuit to ground.
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, B8444S Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification, B8444S Signal Specification, Engine Control Module (ECM)
- Oxygen sensor (Catalyst monitor sensor), B8444S Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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Troubleshooting 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 components

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Verification




Verification

Hint: After repairing, it is necessary to check that the malfunction has been fixed.








- Ignition off
- Reinstall the connectors, components etc.
- Start the engine to perform the diagnosis.
Read off the diagnostic status and trouble status for the diagnostic trouble code.
Check that the diagnosis is "Implemented" and that the trouble status is "No malfunction found". If the trouble status is "Malfunction found", this indicates defective function.





Trouble status shows "No malfunction found"?

Yes - Troubleshooting complete for this DTC

No - Troubleshooting information

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