Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Attempt to start and idle the engine.
Observe the DTC information with a scan tool. DTCs P0089, P00C6, P228C, P2C1F, P228D and P2C20 should not set.
- If any of the DTCs are set
  Refer to Circuit/System Testing.
- Go to next step: If none of the DTCs are set
Engine idling.
Verify the scan tool Fuel Rail Pressure Sensor parameter is approximately 1.9 - 5.0 MPa (276 - 725 PSI).
- If not between 1.9 - 5.0 MPa (276 - 725 PSI)
  Refer to Circuit/System Testing.
- Go to next step: If between 1.9 - 5.0 MPa (276 - 725 PSI)
Verify the scan tool Fuel Rail Pressure Sensor parameter increases or decreases while commanding an increase and decrease in Fuel Rail Pressure with a scan tool.
- Does not change
  Refer to Circuit/System Testing.
- Go to next step: Changes

WARNING:

Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

Road test the vehicle and perform a wide open acceleration from a stop until the transmission shifts into second gear. On manual transmission applications, shift to second gear or stop the test near 2, 500 RPM. Repeat the test at least three times.
Verify DTCs P0089, P00C6, P228C, P2C1F, P228D and P2C20 do not set.
- If any of the DTCs set
  Refer to Circuit/System Testing.
- Go to next step: If none of the DTCs set
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
All OK.