2006 DODGE RAM SRT-10 Service Repair Manual

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Page 2297 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 12. Remove the fuel injector from the fuel rail.
INSTALLATION
3.7/ 4.7/ 5.7L
1. Install fuel injector(s) into fuel rail assembly and install retainingclip(s).
2. If same injector(s) is being reinstall

Page 2298 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual RELAY - FUEL PUMP
DESCRIPTION
The 5–pin, 12–volt, fuel pump relay is located in the Power Distribution Center (PDC). Refer to the label on the PDC
cover for relay location.
OPERATION
The Powertrai

Page 2299 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual MOTOR-IAC
DESCRIPTION
3.7L, 4.7L, 5.7L
3.7L:The IAC stepper motor (3) is mounted to the
throttle body. It regulates the amount of air bypassing
the control of the throttle plate. As engine loads and
a

Page 2300 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 8.3L - SRT-10
The idle air control motor is mounted at the front right
of the intake manifold.
OPERATION
3.7L V-6/4.7L V-8
A separate IAC motor is not used with the 5.7L V-8 engine.
At idle, engine sp

8.3L - SRT-10
The idle air control motor is mounted at the front right
of the intake manifold.
OPERATION
3.7L V-6/4.7L V-8
A separate IAC motor is not used with the 5.7L V-8 engine.
At idle, engine speed can be increased by retracting the IAC motor pintle and allowing more air to pass through the
port, or it can be decreased by restricting the passage with the pintle and diminishing the amount of air bypassing
the throttle plate.
The IAC is called a stepper motor because it is moved (rotated) in steps, or increments. Opening the IAC opens an
air passage around the throttle blade which increases RPM.
The PCM uses the IAC motor to control idle speed (along with timing) and to reach a desired MAP during decel
(keep engine from stalling).
The IAC motor has 4 wires with 4 circuits. Two of the wires are for 12 volts andground to supply electrical current
to the motor windings to operate the stepper motor in one direction. The other2wiresarealsofor12voltsand
ground to supply electrical current to operate the stepper motor in the opposite direction.
To make the IAC go in the opposite direction, the PCM just reverses polarityon both windings. If only 1 wire is
open, the IAC can only be moved 1 step (increment) in either direction. To keeptheIACmotorinpositionwhenno
movement is needed, the PCM will energize both windings at the same time. This locks the IAC motor in place.
In the IAC motor system, the PCM will count every step that the motor is moved. This allows the PCM to determine
the motor pintle position. If the memory is cleared, the PCM no longer knowsthe position of the pintle. So at the
first key ON, the PCM drives the IAC motor closed, regardless of where it wasbefore. This zeros the counter. From
this point the PCM will back out the IAC motor and keep track of its position again.
When engine rpm is above idle speed, the IAC is used for the following:
Off-idle dashpot (throttle blade will close quickly but idle speed will notstopquickly)
Deceleration air flow control
A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the
engine rpm does not dip down when the compressor engages)
Power steering load control
The PCM can control polarity of the circuit to control direction of the stepper motor.
IAC Stepper Motor Program:The PCM is also equipped with a memory program that records the number of steps
the IAC stepper motor most recently advanced to during a certain set of parameters. For example: The PCM was
attempting to maintain a 1000 rpm target during a cold start-up cycle. The last recorded number of steps for that
may have been 125. That value would be recorded in the memory cell so that thenext time the PCM recognizes the

Page 2301 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual identical conditions, the PCM recalls that 125 steps were required to maintain the target. This program allows for
greater customer satisfaction due to greater control of engine idle.
Another function

Page 2302 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 4.7L V-8
The Idle Air Control (IAC) motor (3) is located on the
side of the throttle body.
1. Remove air resonator box at throttle body.
2. Disconnect electrical connector from IAC motor.
3. Remove tw

Page 2303 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual INSTALLATION
3.7L V-6
The Idle Air Control (IAC) motor (3) is located on the
side of the throttle body.
1. Install IAC motor to throttle body.
2. Install and tighten two mounting bolts (screws) to 7
N

Page 2304 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 8.3L - SRT-10
The IAC motor is inserted into a housing at the front of the intake manifold.The IAC motor and housing are ser-
viced together.
1. Attach electrical connector to IAC motor.
2. Install IA

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