Chrysler PT Cruiser. Manual — part 873
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PRESSURE SWITCHES
The PCM/TCM relies on three pressure switches to
monitor fluid pressure in the L/R, 2/4, and OD
hydraulic circuits. The primary purpose of these
switches is to help the PCM/TCM detect when clutch
circuit hydraulic failures occur. The range for the
pressure switch closing and opening points is 11-23
psi. Typically the switch opening point will be
approximately one psi lower than the closing point.
For example, a switch may close at 18 psi and open
at 17 psi. The switches are continuously monitored
by the PCM/TCM for the correct states (open or
closed) in each gear as shown in the following chart:
PRESSURE SWITCH STATES
GEAR
L/R
2/4
OD
R
OP
OP
OP
P/N
CL
OP
OP
1st
CL
OP
OP
2nd
OP
CL
OP
D
OP
OP
CL
OD
OP
CL
CL
OP = OPEN
CL = CLOSED
A Diagnostic Trouble Code (DTC) will set if the
PCM/TCM senses any switch open or closed at the
wrong time in a given gear.
The PCM/TCM also tests the 2/4 and OD pressure
switches when they are normally off (OD and 2/4 are
tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd
gear). The test simply verifies that they are opera-
tional, by looking for a closed state when the corre-
sponding element is applied. Immediately after a
shift into 1st, 2nd, or 3rd gear with the engine speed
above 1000 rpm, the PCM/TCM momentarily turns
on element pressure to the 2/4 and/or OD clutch cir-
cuits to identify that the appropriate switch has
closed. If it doesn’t close, it is tested again. If the
switch fails to close the second time, the appropriate
Diagnostic Trouble Code (DTC) will set.
REMOVAL
(1) Disconnect the battery cables.
(2) Remove air cleaner assembly (Fig. 325).
(3) Remove the battery hold down clamp and
remove the battery (Fig. 326).
Fig. 325 Air Cleaner Assembly Removal/Installation
1 - AIR CLEANER ASSEMBLY
Fig. 326 Battery Removal/Installation
1 - BATTERY
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SOLENOID/PRESSURE SWITCH ASSY (Continued)
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(4) Remove the battery tray (Fig. 327).
(5) Disconnect and remove the input speed sensor
(Fig. 328).
(6) Disconnect the transmission oil cooler lines.
Cap off hoses and fittings to prevent foreign matter
intrusion.
(7) Disconnect the solenoid/pressure switch assem-
bly connector.
(8) Remove
the
three
solenoid/pressure
switch
assembly-to-transaxle case bolts (Fig. 329).
(9) Remove solenoid/pressure switch assembly and
gasket (Fig. 330).
CAUTION: Be sure to keep foreign material from
entering ports in transaxle case. Erratic transaxle
operation and/or failure can result.
INSTALLATION
(1) Install solenoid/pressure switch assembly to
case using a new gasket (Fig. 330).
Fig. 327 Battery Tray Removal/Installation
1 - BATTERY TRAY
Fig. 328 Input Speed Sensor
1 - INPUT (TURBINE) SPEED SENSOR
Fig. 329 Attaching Bolts
1 - BOLTS
2 - SOLENOID AND PRESSURE SWITCH ASSEMBLY
Fig. 330 Solenoid/Pressure Switch Assembly and
Gasket
1 - SOLENOID/PRESSURE SWITCH ASSEMBLY
2 - GASKET
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SOLENOID/PRESSURE SWITCH ASSY (Continued)
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(2) Install bolts and torque to 13 N·m (110 in. lbs.)
(Fig. 329).
(3) Install 8-way connector and torque screw to 4
N·m (35 in. lbs.).
(4) Uncap and install transmission oil cooler lines.
(5) Install input speed sensor (Fig. 328) and torque
to 27 N·m (20 ft. lbs.).
(6) Install the battery tray (Fig. 327).
(7) Install the battery and hold down clamp (Fig.
326).
(8) Install air cleaner assembly (Fig. 325).
(9) Connect battery cables.
(10) Perform Transaxle Quick Learn Procedure.
Refer to SERVICE PROCEDURES.
SPEED SENSOR - INPUT
DESCRIPTION
The Input Speed Sensor is a two-wire magnetic
pickup device that generates AC signals as rotation
occurs. It is threaded into the transaxle case (Fig.
331), sealed with an o-ring (Fig. 332), and is consid-
ered a primary input to the Powertrain/Transmission
Control Module.
OPERATION
The Input Speed Sensor provides information on
how fast the input shaft is rotating. As the teeth of
the input clutch hub pass by the sensor coil (Fig.
333), an AC voltage is generated and sent to the
PCM/TCM. The PCM/TCM interprets this informa-
tion as input shaft rpm.
The PCM/TCM compares the input speed signal
with output speed signal to determine the following:
• Transmission gear ratio
• Speed ratio error detection
• CVI calculation
The PCM/TCM also compares the input speed sig-
nal and the engine speed signal to determine the fol-
lowing:
• Torque converter clutch slippage
• Torque converter element speed ratio
Fig. 331 Input Speed Sensor Location
1 - INPUT SPEED SENSOR
Fig. 332 O-Ring Location
1 - INPUT SPEED SENSOR
2 - O-RING
Fig. 333 Sensor Relation to Input Clutch Hub
1 - INPUT SPEED SENSOR
2 - TRANSAXLE CASE
3 - INPUT CLUTCH HUB
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SOLENOID/PRESSURE SWITCH ASSY (Continued)
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REMOVAL
CAUTION: When disconnecting speed sensor con-
nector, be sure that the connector weather seal
does not fall off or remain in old sensor.
(1) Disconnect the battery cables.
(2) Remove air cleaner assembly (Fig. 334).
(3) Remove the battery hold down clamp and
remove the battery (Fig. 335).
(4) Remove the battery tray (Fig. 336).
Fig. 334 Air Cleaner Assembly Removal/Installation
1 - AIR CLEANER ASSEMBLY
Fig. 335 Battery Removal/Installation
1 - BATTERY
Fig. 336 Battery Tray Removal/Installation
1 - BATTERY TRAY
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SPEED SENSOR - INPUT (Continued)
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