Check The Signal Waveform Of HO2S
- Ignition switch is turned "OFF". Connect HO2S connector.
- Start the engine.
- With engine at operating temperature, monitor signal waveform of HO2S with GDS.
- Is the sensor switching properly?
YES
- Go to "Check fuel filter" as follows.
NO
- Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.