Circuit/System Verification
- If the ignition has been OFF for 8 hours or greater, the ambient temperature, the IAT and the ECT should be within 9°C (16°F) of each other. Ignition ON, observe the scan tool Ambient Temperature, IAT Sensor and the ECT Sensor parameters. Compare those sensor parameters to each other to determine if the condition is current.
- If the ECT Sensor parameter and/or the IAT Sensor parameter appears to be inaccurate, measure and record the resistance of the sensors at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.
- Drive the vehicle under various operating conditions. Observe the scan tool Ambient Temperature parameter. The reading should correlate closely to the current ambient temperature.
- 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.