Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the wiring and component




- Ignition off.
Check the rear heated oxygen sensor (HO2S) connector. Check 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 #65 and heated oxygen sensor (HO2S) connector terminal #2. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try a new rear 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 rear heated oxygen sensor (HO2S), see Replacing lambda sond rear Removal and Replacement
- 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.








- Reinstall the components, reconnect the connectors etc.
- Connect VCT2000
- Start the engine and allow to idle for approximately 2 minutes.
Check whether diagnostic trouble code (DTC) ECM-18 or ECM-1C has changed status to intermittent.





Is diagnostic trouble code (DTC) ECM-18 or ECM-1C intermittent?

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 wiring and component

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