Checking components and wiring
Check the heated oxygen sensor (HO2S) and engine control module (ECM) connectors for contact resistance and oxidation according to Contact resistance and oxidation .
Check that the resistance in the heated oxygen sensor (HO2S) preheating element, between terminals 1 and 2, is approximately 5-10 Ω at +20 °C.
Check the signal cable between engine control module (ECM) terminal 63 and heated oxygen sensor (HO2S) terminal 2 for an intermittent open-circuit. Remedy according to Open-circuit, intermittent faults .
Remedy as necessary.
Other information
- To connect the breakout box, see Connecting the breakout box. EMS 2000
- To access / replace the heated oxygen sensor (HO2S), see Replace the front heated oxygen sensor (HO2S) .
- Continue
Refer to Information