Circuit/System Verification
- If the ignition has been OFF for 8 hours or greater, the IAT, the ambient temperature, and the engine coolant temperature (ECT) should be within 9°C (16°F) of each other. Ignition ON, observe the scan tool IAT Sensor, Ambient Temperature, and the ECT Sensor parameters. Compare those sensor parameters to each other to determine if the condition is current.
- Ignition OFF for 90 seconds, determine the current vehicle testing altitude. Ignition ON, observe the scan tool BARO Sensor parameter. Compare the parameter to the Altitude Versus Barometric Pressure table. The parameter should be within the specified range indicated in the table. If the parameter is not within range, refer to DTC P2227, P2228, or P2229 .
- Engine operating at idle, observe the scan tool MAF Sensor parameter. The reading should be between 2-8 g/s.
- Drive the vehicle under various operating conditions. Observe the scan tool IAT Sensor parameter and the Ambient Temperature parameter. The readings should be near each other.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.