Signal Too Low

Signal too low

Checking the components and wiring

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

Checking fuses
Check the fuse for the circuit.
Replace the fuse if necessary.
If the fuse is blown, check the subsequent circuit for a short-circuit to ground.

Checking the signal cable
Check the signal cable between heated oxygen sensor (HO2S) #3 and the system relay. Check for a short-circuit to ground.

Note! If possible, measure from the rear of the affected connectors in order to minimize any damage and future loose connections.

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 Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- Oxygen sensor (Catalyst monitor sensor) Oxygen Sensor (Catalyst Monitor Sensor)
- Checking wiring and terminals Checking Wiring and Terminals










Continue - Verification

-------------------------------------------------

Verification




Verification

Verification

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




- Reinstall the connectors, components etc.
- Test drive the car at an even speed (engine speed (RPM) above 2000 rpm) for at least 5 minutes
- Connect VCT2000 to the data link connector (DLC) without switching off the engine.

Note! If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated.

Read off the diagnostic status and the fault status for the diagnostic trouble code (DTC).
Check that the diagnostic is "Completed" and that the fault status is "No fault detected".





Is the fault status "No fault detected"?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

-------------------------------------------------

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

------------------------

Attempt New Test - Checking the components and wiring

-------------------------------------------------