Component Inspection
- Check HO2S (B1/S1) Heater resistance
- Ignition "OFF".
- Disconnect HO2S connector.
- Measure resistance between power and control terminals of HO2S heater (Component Side).RESISTANCE SPECIFICATION
HO2S Heater Normal Parameter 20°C (68°F) Heater Resistance 2.5~4.0 Ω - Is the measured resistance within specification?
YES
- Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check HO2S for contamination, deterioration, or damage. Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.