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.




Fig. 1) Signal waveform of front (the upper) and rear (the lower) HO2S at idle
(4) Is the sensor switching properly ?





2. Check HO2S
(1) IG "OFF" and disconnect HO2S connector.
(2) Check that the HO2S is securely installed.
(3) Check the HO2S for contamination or damage
(4) Is the sensor normal ?






NOTE: 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