Component Inspection
- Check the Signal waveform of HO2S
- IG "OFF" and connect HO2S connector.
- Engine start.
- After warming-up, monitor signal waveform of HO2S with scantool.
Specification : Refer to SIGNAL WAVEFORM & DATA
- Is the sensor switching properly?
YES
Go to "Check HO2S" as below.
NO
Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Check HO2S
- IG "OFF" and disconnect HO2S connector.
- Check that the HO2S is securely installed.
- Check the HO2S for contamination or damage
- Is the sensor normal?
YES
Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
Substitute with a known - good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.