Dodge Dakota (ND). Manual — part 475
REMOVAL
3.7L / 4.7L ENGINES
1. Disconnect negative battery cable at battery.
2. Remove air intake tube at top of throttle body.
The accelerator cable must be partially removed to
gain access to speed control cable.
3. Hold throttle in wide open position. While held in
this position, slide throttle cable pin (1) from throttle
body bellcrank.
4. Using a pick or small screwdriver, press release
tab (2) to release plastic cable mount from bracket.
Press on tab only enough to release cable from
bracket. If tab is pressed too much, it will be
broken. Slide plastic mount (4) towards right side
of vehicle to remove throttle cable from throttle
body bracket.
5. Using finger pressure only, disconnect servo cable
connector (2) at throttle body bellcrank pin by
pushing connector off bellcrank pin towards front of
vehicle. DO NOT try to pull connector off per-
pendicular to the bellcrank pin. Connector will
be broken.
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SPEED CONTROL
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6. Slide speed control cable plastic mount (2) towards
right of vehicle to remove cable from throttle body
bracket.
7. Remove servo cable from servo. Refer to Servo
Removal/Installation.
INSTALLATION
3.7L / 4.7L ENGINES
1. Install end of cable to speed control servo. Refer to Servo Removal/Installation.
2. Slide speed control cable plastic mount into throttle body bracket.
3. Install speed control cable connector onto throttle body bellcrank pin (push rearward to snap into location).
4. Slide throttle (accelerator) cable plastic mount into throttle body bracket. Continue sliding until cable release tab
is aligned to hole in throttle body mounting bracket.
5. While holding throttle to wide open position, place throttle cable pin into throttle body bellcrank.
6. Install air intake tube to top of throttle body.
7. Connect negative battery cable at battery.
8. Before starting engine, operate accelerator pedal to check for any binding.
SERVO-SPEED CONTROL
DESCRIPTION
A speed control servo is used only with 3.7L V-6
or 4.7L V-8 engines.
The speed control servo (6) is located in the engine
compartment and is attached to the right inner fender.
The servo unit consists of a solenoid valve body, and
a vacuum chamber. The solenoid valve body contains
three solenoids:
•
Vacuum
•
Vent
•
Dump
The vacuum chamber contains a diaphragm with a
cable attached to control the throttle linkage.
OPERATION
A speed control servo is used only with 3.7L V-6 or 4.7L V-8 engines.
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SPEED CONTROL
8P - 5
The Powertrain Control Module (PCM) controls the solenoid valve body. The solenoid valve body controls the appli-
cation and release of vacuum to the diaphragm of the vacuum servo. The servo unit cannot be repaired and is
serviced only as a complete assembly.
Power is supplied to the servo’s by the PCM through the brake switch. The PCM controls the ground path for the
vacuum and vent solenoids.
The dump solenoid is energized anytime it receives power. If power to the dump solenoid is interrupted, the sole-
noid dumps vacuum in the servo. This provides a safety backup to the vent and vacuum solenoids.
The vacuum and vent solenoids must be grounded at the PCM to operate. When the PCM grounds the vacuum
servo solenoid, the solenoid allows vacuum to enter the servo and pull open the throttle plate using the cable. When
the PCM breaks the ground, the solenoid closes and no more vacuum is allowed to enter the servo. The PCM also
operates the vent solenoid via ground. The vent solenoid opens and closes a passage to bleed or hold vacuum in
the servo as required.
The PCM duty cycles the vacuum and vent solenoids to maintain the set speed, or to accelerate and decelerate the
vehicle. To increase throttle opening, the PCM grounds the vacuum and vent solenoids. To decrease throttle open-
ing, the PCM removes the grounds from the vacuum and vent solenoids. When the brake is released, if vehicle
speed exceeds 30 mph to resume, 35 mph to set, and the RES/ACCEL switch has been depressed, ground for the
vent and vacuum circuits is restored.
REMOVAL
The speed control servo assembly (6) is attached to
the right inner fender under the air cleaner filter hous-
ing.
1. Disconnect negative battery cable at battery.
2. Remove air cleaner filter housing assembly.
3. Disconnect vacuum line (1) at servo.
4. Disconnect electrical connector (5) at servo.
5. Remove three servo mounting screws (3).
6. Disconnect servo cable at throttle body. Refer to
Servo Cable Removal/Installation.
Note: The servo and mounting bracket displayed is a
typical unit.
7. Remove 2 mounting nuts (1) holding servo cable
sleeve (4) to bracket.
8. Pull speed control cable sleeve and servo away
from servo mounting bracket to expose cable
retaining clip (3) and remove clip. Note: The servo
mounting bracket displayed is a typical bracket and
may/may not be applicable to this model vehicle.
9. Remove servo (2) from mounting bracket. While
removing, note orientation of servo to bracket.
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SPEED CONTROL
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INSTALLATION
1. Position servo (2) to mounting bracket.
2. Align hole in cable connector with hole in servo pin.
Install cable-to-servo retaining clip (3).
3. Insert servo mounting studs through holes in servo
mounting bracket.
4. Install two servo-to-mounting bracket nuts (1) and
tighten. Refer to torque specifications.
5. Position servo assembly (6) to inner fender and
install three screws (3). Tighten 3 screws. Refer to
torque specifications.
6. Connect vacuum line (1) to servo.
7. Connect electrical connector (5) to servo.
8. Connect servo cable (2) to throttle body. Refer to
Servo Cable Removal/Installation.
9. Install air filter housing assembly.
10. Connect negative battery cable to battery.
11. Before starting engine, operate accelerator pedal
to check for any binding.
SWITCH-SPEED CONTROL
DESCRIPTION
Two separate switch pods operate the speed control system. The steering-wheel-mounted switches use multiplexed
circuits to provide inputs to the PCM for ON, OFF, RESUME, ACCELERATE, SET, DECEL and CANCEL modes.
Refer to the owner’s manual for more information on speed control switch functions and setting procedures.
The individual switches cannot be repaired. If one switch fails, the entire switch module must be replaced.
OPERATION
When speed control is selected by depressing the ON, OFF switch, the PCM allows a set speed to be stored in its
RAM for speed control. To store a set speed, depress the SET switch while the vehicle is moving at a speed
between approximately 35 and 85 mph. In order for the speed control to engage, the brakes cannot be applied, nor
can the gear selector be indicating the transmission is in Park or Neutral.
The speed control can be disengaged manually by:
•
Stepping on the brake pedal
•
Depressing the OFF switch
•
Depressing the CANCEL switch.
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SPEED CONTROL
8P - 7
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