Ignition "OFF".
Measure resistance between terminals 3 and 4 of the sensor connector (Component side)
Specification
Temp.(℃) | Temp.(℉) | Rear HO2S Heater Resistance(Ω) | Temp.(℃) | Temp.(℉) | Rear HO2S Heater Resistance(Ω) |
20 | 68 | 9.2 | 500 | 932 | 19.2 |
100 | 212 | 10.7 | 600 | 1,112 | 20.7 |
200 | 392 | 13.1 | 700 | 1,292 | 22.5 |
300 | 572 | 14.6 | 800 | 1,472 | 25.1 |
400 | 752 | 17.7 | 900 | 1,652 | 26.5 |
Is resistance within the 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.
