be corrected before proceeding. Refer to the Instru-
ment Panel and Gauges for speedometer diagnosis.
If a road test verifies a surge following a set and
the speedometer operates properly see “Overshoot/
Undershoot on speed control set”.
If a road test verifies an inoperative system, 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.
• Loose or corroded electrical connections at the
servo. Corrosion should be removed from electrical
terminals and a light coating of Mopar Multipurpose
Grease, or equivalent, applied.
• Leaking vacuum reservoir.
• Loose or leaking vacuum hoses or connections.
• Defective one-way vacuum check valve.
• Secure attachment at both ends of the speed
control servo cable.
• Smooth operation of throttle linkage and throttle
body air valve.
• Conduct electrical test at PCM.
• Failed speed control servo. 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.
CHECKING FOR DIAGNOSTIC CODES
OPERATION
When trying to verify a speed control system elec-
tronic malfunction: Connect a DRB scan tool if avail-
able to the data link connector. The connector is
located at left side of the steering column, and at
lower edge of the panel.
A speed control malfunction may occur without a
diagnostic code being indicated.
For further information and usage of the DRB scan
tool and a more complete list of Diagnostic Trouble
Code and No Trouble Codes, refer to the Powertrain
Diagnostic Manual.
REMOVAL AND INSTALLATION
SERVO
REMOVAL
(1) Disconnect the negative battery cable.
(2) Remove three bolts from servo bracket.
(3) Disconnect electrical connectors and vacuum
hose.
(4) Remove two nuts attaching speed control cable
and mounting bracket to servo.
(5) Remove servo mounting bracket.
(6) Pull cable away from servo to expose retaining
clip and remove clip attaching cable to servo.
INSTALLATION
(1) With throttle in full open position align hole in
speed control cable sleeve with hole in servo pin and
install retaining clip.
(2) Connect vacuum hose to servo.
(3) Connect electrical connector.
(4) Insert servo studs through holes in speed con-
trol cable and mounting bracket.
(5) Install nuts, tighten to 6.7 N·m (60 in. lbs.).
(6) Install servo and bracket and tighten bolt and
nuts.
(7) Connect negative battery cable.
SPEED CONTROL SWITCH
REMOVAL
The speed control switch is mounted in the steer-
ing wheel and wired through the clock spring device
under the airbag module.
WARNING: IF REMOVAL OF AIRBAG MODULE IS
NECESSARY, REFER TO the RESTRAINT SYSTEMS
section for more information.
(1) Remove the negative battery cable.
(2) Turn off ignition.
(3) Remove two screws from side of the switch.
(4) Rock switch away from airbag and steering
wheel.
(5) Disconnect two-way electrical connector.
(6) Repeat for the other switch.
INSTALLATION
(1) Connect two-way electrical connector.
(2) Install switch.
(3) Install two screws into the side of the switch.
(4) Repeat for the other switch.
(5) Install the negative battery cable.
SPEED CONTROL SERVO CABLE—2.7L
REMOVAL
(1) Disconnect the negative battery cable.
(2) Remove speed control cable from throttle cam
by sliding clasp out hole used for throttle cable.
(3) Compress the retaining tabs on the cable and
slide cable out of bracket.
(4) Remove 2 nuts and 1 bolt from servo bracket.
LH VEHICLE SPEED CONTROL SYSTEM 8H - 5
DESCRIPTION AND OPERATION (Continued)
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