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.

Ignition ON.
Verify there are no other DTCs set.
- If any other DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- Go to next step: If no other DTCs are set
Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
- If 90 % or greater
  Refer to Throttle Body Inspection and Cleaning .
- Go to next step: If less than 90 %
Engine Idling at the normal operating temperature.
Verify the actual Engine Speed is not 100 RPM less than the Desired Idle Speed.
- If not within 100 RPM of the Desired Idle Speed
  Refer to Circuit/System Testing.
- Go to next step: If within 100 RPM of the Desired Idle Speed
Verify the actual Engine Speed is not 200 RPM greater than the Desired Idle Speed.
- If 200 RPM or greater than the Desired Idle Speed
  Refer to Circuit/System Testing.
- Go to next step: If within 200 RPM of the Desired Idle Speed
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