Ignition "OFF"
Measure resistance between power and control terminals of HO2S(B1/S1) heater(Component Side).
Temp.(℃) | Temp.(℉) | Heater Resistance (Ω) |
18 ~ 20 | 64 ~ 82 | 3.3 ~ 4.1 |
Is resistance within specification?
 | ▶ 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 |
 | ▶ 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 |
Ignition "OFF"
Disconnect HO2S connector.
Measure resistance between Heater Control terminal and Heater Power terminal of the HO2S connector. (Component side)
HO2S Heater | Normal Parameter |
18 ~ 20℃ | |
Heater Resistance | 3.2±0.8 Ω |
Is HO2S heater resistance display near the specified value?
| ▶ 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. |
| ▶ 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. |
