Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking wiring and components
Check heated oxygen sensor (HO2S) resistance between #3 and #4.
Check signal cable between heated oxygen sensor (HO2S) #4 and control module #A17 (#A17) for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box, B5254T2 Connecting the Test Box.
- To access/replace the heated oxygen sensor (HO2S), see Heated oxygen sensors (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing.
- For resistance values, see Component specifications Specifications.
- 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.








- Ignition off
- Reinstall the components, reconnect the connectors etc.
- Start the engine. Allow the engine to idle.
Read off the diagnostic trouble code (DTC) status for the front heated oxygen sensor (HO2S).
The text NOT READY is displayed if the diagnosis is underway.









Is NOT DETECTED displayed?

Yes - Verification completed

No - Fault-tracing information

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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 wiring and components

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