Checking the wiring and component
Check the resistance of the front heated oxygen sensor (HO2S) element between #1 and #2. Resistance should be approximately 1.0 Ω at 20 °C.
Check the heated oxygen sensor (HO2S) connector. Check for contact resistance. Check for oxidation.
Check the cable between control module terminal #A18 and front heated oxygen sensor (HO2S) terminal #2. Check for a short-circuit to ground. Check for an open-circuit.
Check the cable between front heated oxygen sensor (HO2S) terminal #1 and the system relay. Check for an open-circuit.
Remedy as necessary.
Other information
- See Checking wiring and terminals. permanent fault
- See connecting the breakout box
- See Replacing the engine control module (ECM)
- See Heated oxygen sensor (HO2S), replacing
- See Signal specification .
- Continue
Refer to Verification