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.

NOTE:

If you were sent here from DTC P00C7, P0100, P0101, P0102, P0103 - Refer to: Circuit/System Testing.

Ignition - On / Vehicle - In Service Mode
Verify DTC P0641, P0651, P0697, P06A3, P06D2 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
Verify the scan tool parameter: MAP Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
- 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.
Accessories - Off
Verify the scan tool parameter:
- MAP Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
- MAP Sensor = The value should change with accelerator pedal input.
- 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 scan tool parameter: MAP Sensor = The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector: B65 Intake Manifold Pressure and Air Temperature 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 that no DTCs are set.
- If the DTC sets
  Refer to: Circuit/System Testing
- Go to next step: If the DTC is not set
All OK.