Check HO2S (B1/S1) Heater Resistance
WARNING: This page is about a different variant/trim than selected.
- Turn "OFF" the ignition switch.
- Disconnect HO2S connector.
- Measure resistance between power and control terminals of HO2S (downstream) heater (Component Side).
Specification:
Temp. (°C) Temp. (°F) Heater Resistance (Ω) 18 ~ 20 64 ~ 82 Approx. 3.3 ~ 4.10. - Is the measured 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.