Chrysler PT Cruiser. Manual — part 524
• 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.
CABLE
DESCRIPTION
The speed control servo cable is connected between
the speed control vacuum servo diaphragm and the
throttle body control linkage.
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
REMOVAL
(1) Remove the air cleaner lid, and makeup air
hose.
(2) Remove the negative battery cable.
(3) Remove the engine cover and throttle control
shield, if equipped.
(4) Remove two nuts attaching speed control cable
and mounting bracket to servo (Fig. 6).
(5) Remove servo from the mounting bracket.
(6) Disconnect electrical connectors and vacuum
hose.
(7) Remove retaining clip holding cable to servo
(Fig. 3).
(8) Remove throttle cable clasp from the throttle
body cam (Fig. 4).
(9) Remove speed control cable from throttle cam
by sliding clasp out hole used for throttle cable.
(10) Compress the retaining tabs on the cables and
slide cables out of bracket (Fig. 5).
Fig. 3 Cable Clip
1 - HAIRPIN CLIP
Fig. 4 Throttle Cable and Speed Control Cable
8P - 4
SPEED CONTROL
PT
SPEED CONTROL (Continued)
REMOVAL - 2.4L TURBO
(1) Disconnect the negative battery cable.
(2) Remove the throttle control shield (Fig. 7).
(3) Remove the speed control cable from the throt-
tle body lever.
(4) Remove from throttle cable bracket by com-
pressing the retaining tabs on the cable and slide
cable out of the bracket (Fig. 8).
Fig. 5 Retaining Tabs
Fig. 6 Speed Control System
Fig. 7 THROTTLE CONTROL SHIELD
Fig. 8 Retaining Tabs
PT
SPEED CONTROL
8P - 5
CABLE (Continued)
(5) Remove the vacuum line from the speed control
servo (Fig. 9).
(6) Remove the 2 nuts from the speed control servo
studs (Fig. 10).
(7) Push and pull up the speed control servo from
the mounting bracket.
(8) Unlock and disconnect the electrical connector
from the speed control servo (Fig. 9).
(9) Remove the 2 push clips and discard.
(10) Remove the retaining clip holding cable to
servo (Fig. 11).
(11) Remove the cable.
INSTALLATION
INSTALLATION
(1) Install cable core wire through center hole on
bracket, onto servo center post.
(2) Install retaining clip to cable at servo (Fig. 3).
(3) Slide cable bell housing over servo mounting
studs through the bracket.
(4) Install 2 nuts, tighten to 7 N·m (60 ins. lbs.).
(5) Slide cables into throttle cable bracket and
engage retaining tabs (Fig. 4).
(6) Rotate the throttle cam forward to the wide
open position and install speed control cable clasp
(Fig. 4).
(7) Rotate the throttle cam forward to the wide
open position and install throttle cable clasp.
(8) Install engine cover and throttle control shield,
if equipped.
(9) Install the negative battery cable.
(10) Install the air cleaner lid, makeup air hose.
INSTALLATION - 2.4L TURBO
(1) Install the cable.
(2) Install the retaining clip holding cable to servo
(Fig. 11).
(3) Connect and Lock the electrical connector to
the speed control servo (Fig. 9).
(4) Install the speed control servo to the mounting
bracket.
(5) Install the 2 nuts to the speed control servo
studs (Fig. 10) and tighten to 7 N·m(60 in. lbs.).
(6) Install the vacuum line to the speed control
servo nipple (Fig. 9).
Fig. 9 VACUUM AND ELECTRICAL CONNECTION
1 - Electrical Connector
2 - Vacuum Line and Nipple
Fig. 10 SPEED CONTROL SERVO - 2.4L TURBO
Fig. 11 Cable Clip
1 - HAIRPIN CLIP
8P - 6
SPEED CONTROL
PT
CABLE (Continued)
(7) Install speed control cable to throttle cable
bracket (Fig. 8).
(8) Install the speed control cable to the throttle
body lever.
(9) Install the throttle control shield (Fig. 7).
(10) Connect the negative battery cable.
SERVO
DESCRIPTION
The servo unit consists of a solenoid valve body,
and a vacuum chamber. The solenoid valve body con-
tains three solenoids:
• Vacuum
• Vent
• Dump
The vacuum chamber contains a diaphragm with a
cable attached to control the throttle linkage.
OPERATION
The PCM controls the solenoid valve body. The
solenoid valve body controls the application and
release of vacuum to the diaphragm of the vacuum
servo. The servo unit cannot be repaired and is ser-
viced only as a complete assembly.
Power is supplied to the servo 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 solenoid dumps vacuum in the servo. This pro-
vides a safety backup to the vent and vacuum sole-
noids.
The vacuum and vent solenoids must be grounded
by 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 sole-
noid via ground. The vent solenoid opens and closes a
passage to bleed or hold vacuum in the servo as
required.
The PCM cycles the vacuum and vent solenoids to
maintain the set speed, or to accelerate and deceler-
ate the vehicle. To increase throttle opening, the
PCM grounds the vacuum and vent solenoids. To
decrease throttle opening, the PCM removes the
grounds from the vacuum and vent solenoids.
REMOVAL
REMOVAL
(1) Remove the air cleaner lid, and makeup air
hose.
(2) Remove the negative battery cable.
(3) Remove two nuts attaching speed control cable
and mounting bracket to servo (Fig. 12).
(4) Remove servo from the mounting bracket.
(5) Disconnect electrical connectors and vacuum
hose.
(6) Remove the engine cover.
(7) Remove cable from throttle cam. Refer to Speed
Control Servo Cable Removal/Installation in this sec-
tion.
(8) Remove the 2 push nuts and discard.
(9) Remove clip attaching cable to servo (Fig. 13).
REMOVAL - 2.4L TURBO
(1) Disconnect the negative battery cable.
(2) Remove the throttle control shield (Fig. 7).
(3) Remove the speed control cable from the throt-
tle body lever.
(4) Remove the vacuum line from the speed control
servo (Fig. 9).
(5) Remove the 2 nuts from the speed control servo
studs (Fig. 10).
Fig. 12 Speed Control System
PT
SPEED CONTROL
8P - 7
CABLE (Continued)
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