Circuit/System Verification
WARNING: This page is about a different car, the 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On / Vehicle - In Service Mode
- Verify there are no DTCs set related to the following system/component:HO2S Heater
- If a related DTC is set
- Go to next step: If a related DTC is not set
- Engine - Idling - At normal operating temperature.
- Verify the scan tool parameter: HO2S 1, 2 = 50 to 1050 mV
- If not between 50 and 1, 050 mV
Refer to: Circuit/System Testing
- Go to next step: If between 50 and 1, 050 mV
- If not between 50 and 1, 050 mV
- Verify the scan tool parameter:
- HO2S 1, 2 = The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B52 Heated Oxygen Sensor
- Wiggle the harness and connector: K20 Engine Control Module
- If the value spikes or drops out
Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)
- Go to next step: If the value does not spike or drop out
- HO2S 1, 2 = The value should not spike or drop out.
- 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
Refer to: Circuit/System Testing
- Go to next step: If the DTC is not set
- If the DTC sets
- All OK.