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 P0097, P0098, P0099, P00F4, P00F5, P00F6, P0102, P0103, P0112, P0113, P0114, 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 in the specified range
Refer to: Circuit/System Testing
- Go to next step: If in the specified range
- Engine - Idling - At normal operating temperature
- Verify the following parameters are within 55°C (99°F) of each other:
- IAT Sensor 1
- IAT Sensor 2
- 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:
- IAT Sensor 1
- IAT Sensor 2
- 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
- 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.