Intake Air Temperature Sensor - Dodge Dakota Sport 2001 Service Manual

14 - 42 FUEL INJECTION
IDLE AIR CONTROL MOTOR (Continued)
(3) Remove two mounting bolts (screws) (Fig. 35).
(4) Remove IAC motor from throttle body.
Fig. 35 Mounting Bolts (Screws)—
IAC Motor—2.5L Engine
1 - IDLE AIR CONTROL MOTOR
2 - MOUNTING SCREWS
INSTALLATION - 3.9L/5.2L/5.9L
The IAC motor is located on the back of the throt-
tle body (Fig. 34).
(1) Install IAC motor to throttle body.
(2) Install and tighten two mounting bolts (screws)
to 7 N·m (60 in. lbs.) torque.
(3) Install electrical connector.
(4) Install air duct at throttle body.
INSTALLATION - 4.7L
(1) Install IAC motor to throttle body.
(2) Install and tighten two mounting bolts (screws)
to 7 N·m (60 in. lbs.) torque.
(3) Install electrical connector.
(4) Install air duct/air box to throttle body.
INSTALLATION - 2.5L
The IAC motor is located on the side of the throttle
body (Fig. 35).
(1) Install IAC motor to throttle body.
(2) Install and tighten two mounting bolts (screws)
to 7 N·m (60 in. lbs.) torque.
(3) Install electrical connector.
(4) Install air duct at throttle body.
INTAKE AIR TEMPERATURE
SENSOR
DESCRIPTION
The 2–wire Intake Manifold Air Temperature (IAT)
sensor is installed in the intake manifold with the
sensor element extending into the air stream.
The IAT sensor is a two-wire Negative Thermal
Coefficient (NTC) sensor. Meaning, as intake mani-
fold temperature increases, resistance (voltage) in the
sensor decreases. As temperature decreases, resis-
tance (voltage) in the sensor increases.
OPERATION
The IAT sensor provides an input voltage to the
Powertrain Control Module (PCM) indicating the
density of the air entering the intake manifold based
upon intake manifold temperature. At key-on, a
5–volt power circuit is supplied to the sensor from
the PCM. The sensor is grounded at the PCM
through a low-noise, sensor-return circuit.
The PCM uses this input to calculate the following:
• Injector pulse-width
• Adjustment of spark timing (to help prevent
spark knock with high intake manifold air-charge
temperatures)
The resistance values of the IAT sensor is the same
as for the Engine Coolant Temperature (ECT) sensor.
REMOVAL - 3.9L/5.2L/5.9L
The intake manifold air temperature sensor is
located in the front/side of the intake manifold (Fig.
36).
(1) Remove air duct at throttle body.
(2) Disconnect electrical connector at sensor (Fig.
36).
(3) Remove sensor from intake manifold.
Fig. 36 Intake Manifold Air Temperature Sensor—
3.9/5.2/5.9L Engines—Typical
1 - INTAKE MANIFOLD AIR TEMPERATURE SENSOR
2 - ELECTRICAL CONNECTOR
AN