Check HO2S (B1/S1) Heater Resistance
- Turn "OFF" the ignition switch.
- Disconnect HO2S connector.
- Measure resistance between power and control terminals of HO2S heater (Component Side).
Specification:
Temp. (°C) Temp. (°F) Heater Resistance (Ω) 18~20 64 ~82 2.5 ~ 3.3 - Is resistance within specification?
YES
- Check for poor connection between ECM 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.