Circuit/System Verification
- 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 (ECM) for further diagnosis.
- If none of the DTCs are set
- If any of the DTCs are set
- If you were sent here from DTC P0068, P0101, P0121, P0236 or P1101; refer to Circuit/System Testing.
- Ignition ON.
- Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%.
- If 90% or greater
Refer to Throttle Body Cleaning .
- If less than 90%
- If 90% or greater
- 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 for further diagnosis.
- If Agree
- If Disagree
- Determine the current vehicle testing altitude.
- Verify the scan tool MAP Sensor pressure 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.
- If the MAP Sensor parameter is in range
- If the MAP Sensor parameter is not in range
- Verify the engine is equipped with a turbocharger.
- If not equipped with a turbocharger
Refer to Step 12.
- If equipped with a turbocharger
- If not equipped with a turbocharger
- Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure
table.
- If the Boost Pressure Sensor parameter is not in range
Refer to DTC P0236 or DTC P0237 or P0238 for further diagnosis.
- If the Boost Pressure Sensor parameter is in range
- If the Boost Pressure Sensor parameter is not in range
- Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine.
- If the Boost Pressure Sensor parameter does not decrease
Refer to DTC P0236 or DTC P0237 or P0238 for further diagnosis.
- If the Boost Pressure Sensor parameter does decrease
- If the Boost Pressure Sensor parameter does not decrease
- 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 Circuit/System Testing.
- If between 26-52 kPa (3.8-7.5 PSI) and changes
- If not between 26-52 kPa (3.8-7.5 PSI) or does not change
- 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.
- Engine idling
- Perform the scan tool snapshot function.
- Increase the engine speed slowly to 3000 RPM and then back to idle.
- Exit from the scan tool snapshot and review the data.
- Observe the MAF Sensor parameter frame by frame with a scan tool.
- If the MAF Sensor parameter does not change smoothly and gradually
Refer to DTC P0101 .
- If the MAF Sensor parameter does 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 a DTC does not set.
- If the DTC sets
Refer to Circuit/System Testing.
- If the DTC does not set
- If the DTC sets
- All OK.