Charge Air Temperature Sensor

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The charge air temperature sensor is located in the charge air duct connection with the throttle body. The sensor is used to measure the intake air temperature from the turbocharger in order to calculate the required amount of fueling.

The charge air temperature sensor incorporates a Negative Temperature Coefficient (NTC) thermistor in a voltage divider circuit. The sensor receives a 5V reference voltage from the Powertrain Control Module (PCM). The resistance of the NTC thermistor decreases as temperature increases. A low intake air temperature produces a high resistance value, and a high intake air temperature produces a low resistance value. The PCM uses the voltage output to help in determining air/fuel mixture, spark timing and idle control.

For additional information, refer to: INTAKE AIR DISTRIBUTION AND FILTERING

If the charge air temperature sensor fails the PCM uses a default charge air temperature of -5°C (23°F).

In the event of a charge air temperature sensor failure, any of the following symptoms may be observed:

• Over fueling, resulting in black smoke emitting from the exhaust
• Poor performance
• Hard starting
• Idle speed control inoperative.