Checking Components
Check the exhaust system for air leakage
Check the cable for a short-circuit to supply voltage or ground.
Check between:
- Engine control module (ECM) #A91 (#B31) and lambda probe #5.
- Engine control module (ECM) #A68 (#B8) and lambda probe #6 (wiring for pump current).
- Engine control module (ECM) #A92 (#B32) and lambda probe #2 (wiring for calibration current).
Check the cable for an open-circuit.
Check between:
- Engine control module (ECM) #A67 (#B7) and lambda probe #1.
HINT: If the above fault-tracing does not remedy the fault, try replacing the heated oxygen sensors (HO2S), as the diagnostic trouble code (DTC) can also be stored by a defective front/rear heated oxygen sensor (HO2S).
Remedy as necessary.
Other information
- see AIR LEAKAGE EXHAUST SYSTEM, CHECK
- see OXYGEN SENSOR (CATALYST MONITOR SENSOR)
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION