Circuit/System Verification

If you were sent here from DTC P0068, P0121, P012B, or P1101 refer to Circuit/System Testing - step 1.
Ignition ON.
Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%.
- 90% or greater
  Refer to Throttle Body Cleaning .
- 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 P0120-P0123, P0220, P0222, P0223, or P2135 for further diagnosis.
- If Agree
Determine the current vehicle testing altitude.
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 - step 1.
- If the MAP Sensor parameter is within range
Engine idling.
Verify the scan tool MAP Sensor 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 Circuit/System Testing - step 1
- If between 26-52 kPa (3.8-7.5 PSI) and changes
Verify the scan tool MAF Sensor g/s parameter changes 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 3000 RPM and then back to idle.
4. Exit from the scan tool snapshot and review the data.
5. Observe the MAF Sensor parameter frame by frame with a scan tool.
- The MAF Sensor parameter does not change smoothly and gradually
  Refer to DTC P0101 .
- The MAF Sensor parameter changes 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 a DTC does not set.
- If the DTC sets
  Refer to Circuit/System Testing - step 1.
- If the DTC does not set
All OK.