Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. 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, or P06A3 for further diagnosis.
- Go to next step : If none of the DTCs are set
Verify the scan tool MAP Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure table.
- If the MAP Sensor parameter is not in range
  Refer to Circuit/System Testing below for further diagnosis.
- Go to next step : If the MAP Sensor parameter is within range
Engine idling, verify the scan tool MAP Sensor voltage parameter is between the specified value listed below :
0.3 - 4.8 V and changes with accelerator pedal input - Without turbocharger

0.2 - 4.5 V and changes with accelerator pedal input - With turbocharger
- If not between the specified value or does not change
  Refer to Circuit/System Testing below.
- Go to next step : If between the specified value and changes
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If any DTC sets
  Refer to Circuit/System Testing below.
- Go to next step : If no DTC sets
All OK.