Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Verification
- Ignition ON,
- Verify that DTC P0601-P0606, P06A3, and P16F3 is not set.
- If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- If none of the DTCs are set
- If any of the DTCs are set
- 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 %
- 90 % or greater
- Verify the scan tool Throttle Position Sensor 1 and Throttle Position Sensor 2 voltage parameters are greater than 0.0 V.
- If 0.0 V
Refer to Circuit/System Testing
- If greater 0.0 V
- If 0.0 V
- Verify the Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
- If Disagree
Test or replace the Q38 throttle body assembly.
- If Agree
- If Disagree
- Verify DTC P0121, P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 is not set.
- If any of the DTCs are set
Refer to Circuit/System Testing
- If none of the DTCs are set
- If any of the DTCs are set
- Determine the current vehicle testing altitude.
- Verify the scan tool MAP Sensor pressure parameter is within range specified in the Altitude Versus Barometric Pressure
table.
- The MAP Sensor pressure is not in range
Refer to DTC P0106 .
- The MAP Sensor pressure is within range
- The MAP Sensor pressure is not in 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 .
- 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 3,000 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.
- 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 the 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
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.