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 P0641, P0651, P0697, or P06A3 is not set.
- If any of the DTCs are set
Refer to: DTC P0641, P0651, P0697, or P06A3
- Go to next step: If none of the DTCs are set
- If any of the DTCs are set
- Verify DTC P02E8, P02E9, P16A0, P16A1, P16A2 is not set.
- If only DTC P02E8, P02E9 is set
Replace the component: Q20 Intake Air Flow Valve
- If DTC P16A0, P16A1, P16A2 and one or more of the DTCs P02E8, P02E9 is set
Refer to: Circuit/System Testing
- Go to next step: If none of the DTCs are set
- If only DTC P02E8, P02E9 is set
- Perform the scan tool control function: Intake Air Flow Valve Position - Increase & Decrease
Verify the scan tool parameter: Intake Air Flow Valve Position = Desired Intake Air Flow Valve Position
- If not the specified state
Refer to: Circuit/System Testing
- Go to next step: If the specified state
- If not the specified state
- Verify the scan tool parameter: Intake Air Flow Valve Position Sensor = The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector : Q20 Intake Air Flow Valve
- 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 does not set
- If the DTC sets
- All OK.