Check The Signal Waveform Of HO2S

1. IG "OFF". Connect HO2S connector.
2. Connect probe to HO2S to measure signal waveform using oscilloscope function. Start engine.
3. After warming-up, monitor signal waveform of HO2S with GDS.

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4. Is the sensor switching properly?

YES 

• Substitute with a known - good ECM (PCM) and check for proper operation. If the problem is corrected, replace ECM (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.