AIR TEMPRETURE SENSOR XIV. T-MAP sensor consists of a silicon chip mounted inside a reference chamber. On one side of the chip is the reference chamber and on the other side is the pressure to be measured. The electrical resistance of the chip varies with the variation of pressure. This change in resistance alters the voltage signal. ECM interprets the voltage signal as pressure and any change in voltage signal as change in pressure. The temperature sensor element is a NTC resistor. COMPONENT LOCATION Air temperature Sensor is mounted on air intake elbow between the intake manifold and the intercooler. PRELIMINARY CHECKS 1. Inlet Air Circuit Clogging. 2. Loose / Damaged connections between sensor and EMS ECU 3. Check for back out of pins at both sensor connector and ECU connector. 4. Check for damage of pins at both sensor connector and ECU connector. CONNECTOR DETAIL PINOUT DETAILS COMPONENT SPECIFICATION Air temperature Sensor is used to measure the temperature & pressure of the Intake Air one before electronic throttle and other on the intake manifold. The piezo-resistive pressure sensor element and a suitable circuitry for signal amplification are integrated on a silicon chip. The measured pressure operates from above to the active side of the silicon diaphragm. Temperature sensor is a NTC Element. The manifold air pressure sensor is mounted on air intake elbow between the intake manifold and the intercooler and the bolt tightened at specified torque. The Air temperature sensor is a four pin peizoresistance semiconductor device with a negative temperature coefficient. The T-MAP sensor provides intake air pressure and temperature details to ECU, which then calculates the correct quantity of fuel to be injected to each cylinder. A DC signal voltage is produced by the sensor, which gets excited due to varying manifold air pressure which is felt on semiconductor diaphragm. SENSOR STANDALONE DIAGNOSIS Use multi-meter to check for signal voltage at pin1 PIN DESCRIPTION 1 Ground 2 NTC 3 + 5 V 4 Output Signal Diesel Engine Ph-2 (CAFÉ) 209
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