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FLA -258 FUEL SYSTEM 3) After warming-up, monitor signal waveform of HO2S with scantool.? Fig) Signal waveform of front(the upper) and rear(the lower) HO2S at idle SCMF16225L 4) Is the sensor switching properly? YES ▶ Go to "Check HO2S" as below. NO ▶ Substitute with a known - good HO2S and check for proper operation. 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? YES ▶ Substitute with a known - good PCM and check for proper operation. NO ▶ Substitute with a known - good HO2S and check for proper operation. NOTE There is a memory reset function on scantool that can erase optional parts automatically detected and memorized |