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1.2L REVOTRON ENGINE
149
I. Manifold Air Pressure Sensor and
Temperature Sensor (T-MAP) :
Component Details :
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 :
T-MAP Sensor is mounted on Intake
Manifold.
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 View :
Connector Details :
Connector
Description
1
Ground
2
Supply
3
Pressure
4
Temperature
Component Specification :
TMAP Sensor is used to measure the
temperature & pressure of the Intake Air at Intake
Manifold (Before Turbo). 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 intake
manifold plenum and the bolt tightened at
specified torque.
The T-MAP sensor is a four pin peizo-resistance
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 Stand alone Diagnosis :
Use multimeter to check for signal voltage at
pin1 and pin3.
Supply voltage :- 5V DC.
Signal Voltage :
0.4 V at 10 kpa (absolute)
4.65 V at 115 kpa (absolute)