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.
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 (LF4)DTC P0641, P0651, P0697, or P06A3 (LGX) for further diagnosis.
- If none of the DTCs are set
If you were sent here from DTC P0068, P0106, P010B, P0121, P012B, or P1101, refer to Circuit/System Testing.
Verify the scan tool Throttle Body Idle Air Flow Compensation parameter is less than 90 %.
- 90 % or greater
  Refer to Throttle Body Inspection and Cleaning (LGX) .
- If less than 90 %
Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
- If Disagree
  Refer to DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LGX)DTC P0121-P0123, P0222, P0223, P16A0-P16A2, or P2135 (LF4) for further diagnosis.
- If Agree
Determine the current vehicle testing altitude.
Verify both the scan tool Barometric Pressure Sensor Bank 1 and Bank 2 parameters are within the range specified in the Altitude Versus Barometric Pressure table.
- Both of the parameters are not within the specified range
  Refer to the corresponding DTC P2227-P2230 (LF4)DTC P2227-P2230 (LGX) , or DTC P222B-P222E .
- Both parameters are within the specified range
Verify the scan tool parameters listed below are within 3 kPa (0.4 PSI) of each other.
- Barometric Pressure Sensor Bank 1
- Barometric Pressure Sensor Bank 2
- Boost Pressure Sensor
- One or more of the parameters are not within 3 kPa (0.4 PSI) of each other
  Refer to DTC P2227-P2230 (LF4)DTC P2227-P2230 (LGX) , DTC P222B-P222E , or DTC P0236 , as appropriate.
- All the parameters are within the specified range
Engine idling.
Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 PSI) and changes with accelerator pedal input.
- If not between 26-52 kPa (3.8-7.5 PSI) or does not change
  Refer to DTC P0106 (LF4) DTC P0106 (LGX) for further diagnosis.
- If between 26-52 kPa (3.8-7.5 PSI) and changes
Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 PSI) of each other, during a WOT acceleration at the time of the 1-2 shift.
- The parameters are not within 20 kPa (2.9 PSI) of each other
  Refer to the corresponding DTC P0106 (LF4) DTC P0106 (LGX) , or DTC P0236 for further diagnosis.
- The parameters are within 20 kPa (2.9 psi) of each other
Verify the scan tool g/s parameters for MAF Sensor Bank 1 and Bank 2 change smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below.
1. Engine idling
2. Perform the scan tool snapshot function.
3. Increase the engine speed slowly to 3, 000 RPM and then back to idle.
4. Exit from the scan tool snapshot and review the data.
5. Observe the scan tool g/s parameters for MAF Sensor Bank 1 and Bank 2 frame by frame.
- One or both of the MAF Sensor parameters do not change smoothly and gradually
  Refer to Circuit/System Testing, or DTC P010B as appropriate.
- Both the MAF Sensor parameters change smoothly and gradually
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 does not set
All OK.