Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
- Ignition ON.
- Verify no B52 HO2S heater DTCs are set.
- If a HO2S heater DTC is set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If no HO2S heater DTC is set
- If a HO2S heater DTC is set
- Allow the engine to reach operating temperature, engine running.
- Verify the scan tool HO2S Sensor 1 or 2 voltage parameters are between 50-1, 050 mV.
- If not between 50-1, 050 mV
- If between 50-1, 050 mV
- Verify none of the following conditions exist:
- Lean or rich fuel injectors-Refer to Fuel Injector Solenoid Coil Test .
- Water intrusion in the HO2S harness connector
- Low or high fuel system pressure-Refer to Fuel System Diagnosis .
- Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Fuel saturation of the evaporative emission (EVAP) canister
- Exhaust leaks-Refer to Exhaust Leakage .
- Engine vacuum leaks
- Engine coolant consumption-Refer to Loss of Coolant .
- If any of the above conditions exist
Repair as necessary.
- If none of the above conditions exist
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
- Verify the DTC does not set.
- If the DTC sets
Replace the B52 Heated Oxygen Sensor.
- If the DTC does not set
- If the DTC sets
- All OK.