REMOVAL
(1) Disconnect the negative battery cable.
(2) Unplug the wiring harness connector at the
inlet air temperature sensor.
(3) Press together the sensor locking arms and
remove the sensor from the charge air pipe (Fig. 19).
INSTALLATION
(1) Position the inlet air temperature sensor above
the charge air pipe access hole.
(2) Press together the sensor locking tabs, seat the
sensor to the pipe and release tabs (Fig. 19).
(3) Connect negative battery cable.
MANIFOLD AIR FLOW (MAF)
SENSOR
DESCRIPTION
The Mass Air Flow (MAF) Sensor is located in the
air intake port between the air filter and the turbo-
charger (Fig. 20). The MAF sensor uses semiconduc-
tor technology throughout, and is used to calculate
the air mass flowing past it per time unit. This mass
is important for determining the exhaust gas recircu-
lation rate. The MAF sensor sends a corresponding
signal to the ECM, which evaluates the signal to
adjust the exhaust gas recirculation valve.
OPERATION
The ECM uses the mass air flow (MAF) sensor to
measure air density. The temperature resistor located
at the front of the MAF sensor measures the temper-
ature of the inlet air. By varying the voltage, the
electronic circuit regulates the temperature of the
heating resistor in the rear so that it is 320° F
(160°C) higher than the temperature of the intake
air. The temperature at the heating resistor is mea-
sured by a sensor resistor in-between.
Fig. 18 INLET AIR TEMPERATURE SENSOR
1 - INLET AIR TEMPERATURE SENSOR
2 - PIPE
Fig. 19 INLET AIR TEMPERATURE
1 - INLET AIR TEMPERATURE SENSOR
2 - HARNESS CONNECTOR
3 - CHARGE AIR PIPE
Fig. 20 MASS AIR FLOW (MAF) SENSOR
14 - 30 FUEL INJECTION VA
INLET AIR TEMPERATURE SENSOR (Continued)
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