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 P0121, P0122, P0123, P0222, P0223, P0562, P0621, P0622, P16A0-P16A2, P2135 is not set.
- If any of the DTCs are set
- Go to next step: If none of the DTCs are set
- Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90%
- If 90% or greater
Refer to: Throttle Body Cleaning
- Go to next step: If less than 90%
- If 90% or greater
- Perform the following action: Clear the DTCs.
- Ignition/Vehicle - Off
- Ignition - On / Vehicle - In Service Mode
- Perform the scan tool control function: Throttle Sweep - Start
Verify the scan tool parameter: TAC Motor = Enabled
- 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: TAC Motor = Enabled
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: Q38 Throttle Body
- Wiggle the harness and connector: X2 @ K20 Engine Control Module
- If not the specified state
Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)
- Go to next step: If the specified state
- 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.