Operation; Removal; Removal - 2.4L Turbo - Chrysler PT Cruiser Service & Repair Manual

PT
SERVO (Continued)

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.
Fig. 12 Speed Control System
Fig. 13 Attaching Clip
1 - HAIRPIN CLIP
(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).
(6) Push and pull up the speed control servo from
the mounting bracket.
(7) Unlock and disconnect the electrical connector
from the speed control servo (Fig. 10).
(8) Remove the 2 push clips and discard.
(9) Remove the retaining clip holding cable to
servo (Fig. 11).
SPEED CONTROL 8P - 7