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1.5L REVOTORQ ENGINE
187
xv. AIR TEMPERATURE SENSOR
T-MAP sensor consists of a silicon chip mounted
inside a reference chamber. On one side of the
chip is the reference chamber rand on the other
side is the pressure to be measured. The
electrical resistance of the chip varies with the
variation of the 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 the 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
PIN OUT DETAILS
Pin
Description
1
Ground
2
NTC
3
+5V
4
Output Signal
COMPONENT SPECIFICATION
Air Temperature Sensor is used to measure the
temperature and 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 specific torque.
The Air Temperature Sensor is a four pin piezo-
resistive 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.