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DR
SPEED CONTROL (Continued)
5.9L Diesel Engines With Automatic Trans.
If equipped with a diesel powered engine and an
automatic transmission, an electric vacuum pump
and vacuum lines are used to supply vacuum to the
speed control servo. A vacuum reservoir is not used.
DIAGNOSIS AND TESTING - ROAD TEST
Perform a vehicle road test to verify reports of
speed control system malfunction. The road test
should include attention to the speedometer. Speed-
ometer operation should be smooth and without flut-
ter at all speeds.
Flutter in the speedometer indicates a problem
which might cause surging in the speed control sys-
tem. The cause of any speedometer problems should
be corrected before proceeding. Refer to Instrument
Cluster for speedometer diagnosis.
If a road test verifies a system problem and the
speedometer operates properly, check for:
• A Diagnostic Trouble Code (DTC). If a DTC
exists, conduct tests per the Powertrain Diagnostic
Procedures service manual.
• A misadjusted brake (stop) lamp switch. This
could also cause an intermittent problem.
SPECIFICATIONS
TORQUE - SPEED CONTROL
DESCRIPTION
Servo Mounting Bracket-
to-Servo Nuts
Servo Mounting Bracket-
to-Battery Tray Screws
Speed Control Switch
Mounting Screws
Vacuum Reservoir
Mounting Nuts
CABLE
DESCRIPTION
The speed control servo cable is connected between
the speed control vacuum servo diaphragm and the
throttle body control linkage. This cable is used with
3.7L/4.7L/5.9L/8.0L gas powered engines only. It is
also used if equipped with a 5.9L diesel engine
equipped with an automatic transmission.
A speed control servo cable is not used if equipped
with either a 5.9L diesel engine equipped with a
manual transmission, or any 5.7L engine/transmis-
sion combinations.
• Loose, damaged or corroded electrical connec-
tions at the servo (if used). Corrosion should be
removed from electrical terminals and a light coating
of
Mopar
applied.
• Leaking vacuum reservoir (if used).
• Loose or leaking vacuum hoses or connections (if
used).
• Defective one-way vacuum check valve (if used).
• Secure attachment of both ends of the speed con-
trol servo cable (if used).
• Smooth operation of throttle linkage (if used)
and throttle body air valve.
• Failed speed control servo (if used). Do the servo
vacuum test.
CAUTION: When test probing for voltage or conti-
nuity at electrical connectors, care must be taken
not to damage connector, terminals or seals. If
these components are damaged, intermittent or
complete system failure may occur.
N-m
7
4
1.7
3
OPERATION
This cable causes the throttle control linkage to
open or close the throttle valve in response to move-
ment of the vacuum servo diaphragm.
REMOVAL
3.7L / 4.7L GAS
(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.
SPEED CONTROL
MultiPurpose
Grease,
Ft. Lbs.
-
-
-
-
8P - 3
or
equivalent,
In. Lbs.
60
30
15
20
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