Signal Missing. Permanent Fault

Signal missing. Permanent fault

Checking the wiring and component




- Ignition off
- Check the front heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between control module terminal #45 and heated oxygen sensor (HO2S) connector terminal #4. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try a new heated oxygen sensor (HO2S) if no fault is found during the above fault-tracing.
Remedy as necessary.

Other information
- To connect the breakout box and access the control module, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000
- To access or replace the front heated oxygen sensor (HO2S), see Replace the front heated oxygen sensor (HO2S) Service and Repair
- For information about signals see Signal specification Signal Specification.














Continue - Verification

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Verification




Verification

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








- Reconnect the connectors, reinstall components etc.
- Connect VCT2000
- Start the engine. Let the engine idle until it reaches operating temperature.
Read off the signal for the front heated oxygen sensor (HO2S).





Does the value oscillate between approximately 0 and 1 V?

Yes - Resetting the adaptation

No - VERIFICATION FAILED

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Resetting the adaptation

Hint: It is important that the fuel trim is reset after this diagnostic trouble code (DTC) is remedied. If this is not done there may be driveability problems even though the fault is no longer present.




- Ignition on
- Click on the VCT2000 symbol to reset the fuel trim.





Continue - VERIFIED

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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 wiring and component

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