Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If you were sent here from DTC P0096 - Refer to: Circuit/System Testing.

Ignition - On / Vehicle - In Service Mode
Verify DTC P0102, P103, P0641, P0651, P0697, P06A3 is not set.
- If any of the DTCs are set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If none of the DTCs are set
Engine - Running
Verify the scan tool parameter:
- Intake Air Humidity Sensor = 5 to 95% and changes
- IAT Sensor 2 = -39 to 149°C (-38 to 300°F) and changes
- If not in the specified range or does not change
  Refer to: Circuit/System Testing
- Go to next step: If in the specified range and changes
Verify the appropriate scan tool parameter:
- Intake Air Humidity Sensor
- IAT Sensor 2
  Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B75C Multifunction Intake Air 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
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
All OK.