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
1) 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
1) 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 components automatically detected and memorized by PCM.Before or after testing PCM on the vehicle, use this function to reuse the PCM.