Circuit/System Verification
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On / Vehicle - In Service Mode
- Verify DTC P0102, P103, P0641, P0651, P0697, P06A3 is not set.
- If any of the DTCs are set
- Go to next step: If none of the DTCs are set
- Verify the following parameters are within 25°C (45°F) of each other:
- Start-Up IAT Sensor 1
- Start-Up IAT Sensor 2
- Start-Up ECT
- If not within 25°C (45°F) of each other
Refer to: Circuit/System Testing
- Go to next step: If within 25°C (45°F) of each other
- Engine - Running
- Verify the scan tool parameter: Intake Air Humidity Sensor = 5 to 90%
- If not between 5 and 90%
Refer to: Circuit/System Testing
- Go to next step: If between 5 and 90%
- If not between 5 and 90%
- 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.
NOTE:
To minimize the effects of residual engine heat and heating elements inside the sensor, perform step 3 of this procedure only if the ignition has been Off for longer than 8 h.