Component Inspection

Component Inspection

1. Check the Signal waveform of HO2S
(1) IG "OFF" and connect HO2S connector.
(2) Engine start.
(3) After warming-up, monitor signal waveform of HO2S with scantool.




(4) Is the sensor switching properly?
YES
- Check HO2S for poor connection/ installation or damage.
If O.K., Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, replace PCM 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.

CAUTION:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others.