Dodge ZB 2005 Service Manual page 808

ZB
IDLE AIR CONTROL MOTOR (Continued)
OPERATION
The motor controls air flow through a passage con-
nected to both intake manifold plenums. The PCM
operates the idle air control motor. The PCM adjusts
engine idle speed through the idle air control motor
to compensate for engine load or ambient conditions.
The idle air control motor pintle protrudes into a
housing connected to the idle air passage. The pintle
controls air flow through the intake manifold while
the engine idles. By extending or retracting the
pintle, the PCM controls adjusts idle speed for differ-
ent operating conditions.
The PCM adjusts the idle air control motor based
on inputs it receives. The inputs affecting idle speed
include throttle position, crankshaft position, engine
coolant temperature, plus brake switch and air con-
ditioning request signals. By increasing airflow when
the throttle blade closes quickly at road speeds, the
PCM prevents deceleration die out.
REMOVAL
The IAC motor is inserted into a housing at the
front of the intake manifold (Fig. 12). The IAC motor
and housing are serviced together.
(1) Remove housing to manifold screws. Remove
IAC motor and housing.
(2) Disconnect the electrical connector from IAC
motor.
INSTALLATION
The IAC motor is inserted into a housing at the
front of the intake manifold (Fig. 12). The IAC motor
and housing are serviced together.
(1) Attach electrical connector to IAC motor.
(2) Install IAC motor and housing into manifold.
Tighten mounting screws to 4 N·m (35 in. lbs.) torque.
INLET AIR TEMPERATURE
SENSOR
DESCRIPTION
The IAT Sensor is a Negative Temperature Coeffi-
cient (NTC) Sensor that provides information to the
PCM regarding the temperature of the air entering
the intake manifold.
REMOVAL
NOTE: Take care not to damage the thermister pill
when removing the sensor.
(1) Remove the battery cover and disconnect the
negative battery cable.
(2) Disconnect the electrical connector from the
inlet temperature sensor (Fig. 13).
(3) Remove sensor from inlet hose.
Fig. 13 INLET AIR TEMP SENSOR
INSTALLATION
NOTE: Take care not to damage the open thermister
pill when installing the sensor.
(1) Install sensor (Fig. 14), use a little water to aid
in insertion of sensor.
Fig. 14 SENSOR ORIENTATION
(2) Make sure that the rib on the sensor matches
up with the rib on the inlet hose. The thermister pill
should be in direct contact with the inlet air stream.
(3) Connect the electrical connector.
(4) Connect the negative battery cable and install
battery cover.
FUEL INJECTION 14 - 35