Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. 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, P06A3, P06D2 is not set.
- If any of the DTCs are set
  Refer to: DTC P0641, P0651, P0697, P06A3, or P06D2
- If none of the DTCs are set
Verify the scan tool parameter: MAP Sensor = The value should be within the range listed in the following table: Altitude Versus Barometric Pressure
- If not in the specified range
  Refer to: Circuit/System Testing
- If in the specified range
Engine Idling - At normal operating temperature with all accessories Off.
Verify the scan tool parameter: MAP Sensor = 26 to 52 kPa (3.8 to 7.6 PSI)
- If not between 26 to 52 kPa (3.8 to 7.6 PSI)
  Refer to: Circuit/System Testing
- If between 26 to 52 kPa (3.8 to 7.6 PSI)
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: B74 Manifold Absolute Pressure 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)
- 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
- If the DTC is not set
All OK.