Chrysler PT Cruiser Service & Repair Manual page 1686

21 - 274 41TE AUTOMATIC TRANSAXLE
SOLENOID/PRESSURE SWITCH ASSY (Continued)
(2) Install bolts and torque to 13 N·m (110 in. lbs.)
(Fig. 299) .
(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. 298) and torque
to 27 N·m (20 ft. lbs.).
(6) Install the battery tray (Fig. 297) .
(7) Install the battery and hold down clamp (Fig.
296) .
(8) Install air cleaner assembly (Fig. 295) .
(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.
301), sealed with an o-ring (Fig. 302), and is consid-
ered a primary input to the Powertrain/Transmission
Control Module.
Fig. 301 Input Speed Sensor Location
1 - INPUT SPEED SENSOR
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.
303), 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:
Fig. 302 O-Ring Location
1 - INPUT SPEED SENSOR
2 - O-RING
Fig. 303 Sensor Relation to Input Clutch Hub
1 - INPUT SPEED SENSOR
2 - TRANSAXLE CASE
3 - INPUT CLUTCH HUB
• 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
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