Check the condition of HO2S
Check HO2S for poor connection or loose terminal.
Check if HO2S is ensurely installed.
Is the conditions of HO2S normal ?
YES
Go to "Check the Signal waveform of HO2S" as follows.
NO
Repair it and then go to "Verification of Vehicle Repair" procedure.
Check the Signal waveform of HO2S
IG "OFF" and connect HO2S connector.
Engine start.
After warming-up, monitor signal waveform of HO2S with scantool.
Is the sensor switching properly?
YES
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.
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.
