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 that DTC P0641, P0651, P0697, or P06A3 is not set.
- If any of the DTCs are set
  Refer to DTC P0641, P0651, P0697, P06A3, or P06D2 for further diagnosis.
- Go to next step: If none of the DTCs are set

NOTE:

To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 3 and 4 of this verification procedure only if the ignition has been OFF for 8 hours or more.

Ignition ON.
Verify the following scan tool parameters are within 30°C (54°F) of each other.
- Start-Up IAT Sensor 1
- IAT Sensor 2
- IAT Sensor 3
- If not within 30°C (54°F)
  Refer to Circuit/System Testing.
- Go to next step: If within 30°C (54°F)
Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F).
- IAT Sensor 1
- IAT Sensor 2
- IAT Sensor 3
- If not between: -38 and +149°C (-36 and +300°F)
  Refer to Circuit System Testing.
- Go to next step: If between: -38 and +149°C (-36 and +300°F)
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