TFA3 (Supercharger out) Intake Air Temperature Sensor Monitor
12.1.1.3.1. Fault Codes
P0098 - Intake Air Temperature Sensor 2 Circuit High (Bank 1)
P0097 - Intake Air Temperature Sensor 2 Circuit Low (Bank 1)
P0099 - Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic (Bank 1)
P0096 - Intake Air Temperature Sensor 2 Circuit Range/Performance (Bank 1)
12.1.1.3.2. Electrical Monitor
P0098, P0097 and P0099. These monitors run continuously. The voltage output from the sensor is compared to absolute
maximum and minimum thresholds and a suitable code set if exceeded. Additionally, it tests for a loose connection of the
temperature sensor by comparing the difference between the temperature sensor voltage and a low pass filtered value with a 2
second time constant (P0099). If a loose contact occurs, the signal will show a series of step changes between the sensor
voltage and the open circuit voltage. Normally, this temperature does not change rapidly, so there should be only a small
difference between the signal and the filtered signal. If this difference exceeds a threshold then a fault is declared.
12.1.1.3.3. Rationality Monitor
P0096. A stuck sensor is declared if the maximum and minimum temperatures are less than a threshold as measured over a
sufficiently large duty cycle. A large duty cycle is achieved if the number of operational phases with normally higher intake air
temperature (High phase) and lower intake air temperature (Low phase) are
encountered since vehicle start.
12.1.1.3.4. Cold Start Monitor
P0096. An average of the Intake temperatures / Coolant1 / Ambient air Temperature sensor values during an engine OFF
period is calculated. If the particular sensor value minus the average value is greater than a sensor specific threshold for any
period of time, then a fault is declared.