Chrysler Stratus Convertible. Manual — part 252
OPERATION
The speed control electronic control circuitry is
integrated
into
the
Powertrain
Control
Module
(PCM). The PCM speed control functions are moni-
tored by the On-Board Diagnostics (OBD). All OBD-
sensed systems are monitored by the PCM. Each
monitored circuit is assigned a Diagnostic Trouble
Code (DTC). The PCM will store a DTC in electronic
memory for any failure it detects. The PCM cannot
be repaired and must be replaced if faulty.
USE THE DRB SCAN TOOL TO REPROGRAM
THE NEW PCM WITH THE VEHICLES ORIGI-
NAL IDENTIFICATION NUMBER (VIN) AND
THE VEHICLES ORIGINAL MILEAGE. IF THIS
STEP IS NOT DONE A DIAGNOSTIC TROUBLE
CODE (DTC) MAY BE SET.
VACUUM RESERVOIR
The vacuum reservoir is located in the engine com-
partment.
OPERATION
The reservoir stores engine vacuum in the reser-
voir. When engine vacuum drops, as in climbing a
grade while driving, the reservoir supplies the vac-
uum needed to maintain proper speed control opera-
tion. The vacuum reservoir cannot be repaired and
must be replaced if faulty.
VEHICLE SPEED AND DISTANCE
OPERATION
The 4 speed automatic Transmission Control Mod-
ule (TCM) supplies the speed input to the PCM. The
PCM determines acceleration rates. The speed con-
trol software in the PCM uses vehicle speed and
acceleration to control to the set speed.
Vehicles with a 3 speed automatic or manual trans-
mission have a Vehicle Speed Sensor (VSS) mounted
to an adapter near the transmission output shaft.
The sensor is driven through the adapter by a speed-
ometer pinion gear. The VSS pulse signal is moni-
tored by the PCM to determine vehicle speed and to
maintain speed control set speed. Refer to the appro-
priate Powertrain Diagnostic Procedures manual for
diagnosis and testing of this component.
ROAD TEST
OPERATION
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 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.
(1) 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.
JX
VEHICLE SPEED CONTROL SYSTEM
8H - 5
DESCRIPTION AND OPERATION (Continued)
REMOVAL AND INSTALLATION
SERVO
REMOVAL
(1) Remove the negative battery cable.
(2) Disconnect the vacuum hose from servo.
(3) Remove two nuts attaching speed control cable
and mounting bracket to servo.
(4) Remove servo from the mounting bracket.
(5) Disconnect electrical connectors and vacuum
hose.
(6) Remove cable from throttle cam. Refer to Speed
Control Servo Cable Removal/Installation in this sec-
tion.
(7) Remove clip attaching cable to servo.
INSTALLATION
(1) Install servo cable through large hole in
bracket, to servo and install clip.
(2) Install speed control cable to throttle cam.
Refer to Speed Control Servo Cable Removal/Instal-
lation in this section.
(3) Connect electrical connector.
(4) Insert servo studs through holes in speed con-
trol mounting bracket and cable.
(5) Install nuts, tighten to 7 N·m (60 in. lbs.).
(6) Connect the vacuum hose to servo.
(7) Install the negative battery cable.
SPEED CONTROL SWITCH
The speed control switches are mounted in the
steering wheel and wired through the clock spring
device under the airbag module (Fig. 1).
WARNING: IF REMOVAL OF AIRBAG MODULE IS
NECESSARY, REFER TO THE RESTRAINT SYS-
TEMS.
REMOVAL
(1) Remove the negative battery cable.
(2) Turn off ignition.
(3) Remove two screws from side of each 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 switches.
(3) Install two screws to the side of each switch.
(4) Install airbag, refer to the Restraint Systems
(5) Install the negative battery cable.
SPEED CONTROL SERVO CABLE
REMOVAL
(1) Remove the negative battery cable.
(2) Remove the air inlet resonator.
(3) Remove throttle control shield, if equipped (Fig.
3).
(4) Remove throttle cable clasp from the throttle
body cam.
(5) Remove speed control cable from throttle cam
by sliding clasp out hole used for throttle cable.
(6) Compress the retaining tabs on the cable and
slide cable out of bracket.
(7) Remove 2 nuts retaining cable and bracket to
servo.
(8) Slide cable bell housing off of servo mounting
studs.
(9) Remove retaining clip holding cable to servo.
INSTALLATION
(1) Install cable core wire through center hole on
bracket, onto servo center post.
(2) Install retaining clip to cable at servo.
(3) Slide cable bell housing over servo mounting
studs (bracket in between).
(4) Install 2 nuts at cable to and servo bracket to
servo, tighten to 7 N·m (60 ins. lbs.).
(5) Slide cable into throttle cable bracket and
engage retaining tabs.
(6) Rotate the throttle cam forward to the wide
open position and install speed control cable clasp.
(7) Rotate the throttle cam forward to the wide
open position and install throttle cable clasp.
(8) Install throttle control shield, if equipped.
(9) Install the air inlet resonator.
(10) Install the negative battery cable.
8H - 6
VEHICLE SPEED CONTROL SYSTEM
JX
VACUUM RESERVOIR
The vacuum reservoir is located on the dash panel
next to the brake booster.
REMOVAL
(1) 2.5L ONLY Remove the intake manifold, refer
to the Engine section.
(2) Disconnect vacuum hoses from reservoir.
(3) Pull vacuum reservoir from dash panel.
INSTALLATION
(1) Push reservoir onto dash panel.
(2) Connect hoses to reservoir.
(3)
2.5L ONLY Install intake manifold, refer to
the Engine section.
Fig. 3 Throttle Control Shield
1 – MOUNTING TAB
2 – THROTTLE CONTROL SHIELD
3 – MOUNTING SCREW
Fig. 4 Disconnecting Throttle Cable—Typical
1 – TABS
2 – CABLE CLASP
JX
VEHICLE SPEED CONTROL SYSTEM
8H - 7
REMOVAL AND INSTALLATION (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст