Chrysler Dodge Caravan 2002 Manual page 1839

21 - 282 41TE AUTOMATIC TRANSAXLE
SPEED SENSOR - INPUT (Continued)
Fig. 318 O-Ring Location
1 - INPUT SPEED SENSOR
2 - O-RING
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.
319), an AC voltage is generated and sent to the
TCM. The TCM interprets this information as input
shaft rpm.
Fig. 319 Sensor Relation to Input Clutch Hub
1 - INPUT SPEED SENSOR
2 - TRANSAXLE CASE
3 - INPUT CLUTCH HUB
The TCM compares the input speed signal with
output speed signal to determine the following:
• Transmission gear ratio
• Speed ratio error detection
• CVI calculation
The TCM also compares the input speed signal and
the engine speed signal to determine the following:
• Torque converter clutch slippage
• Torque converter element speed ratio
REMOVAL
(1) Disconnect battery negative cable.
(2) If necessary, disconnect and cap off transmis-
sion oil cooler lines.
(3) Disconnect input speed sensor connector.
(4) Unscrew and remove input speed sensor (Fig.
320).
(5) Inspect speed sensor o-ring (Fig. 321) and
replace if necessary.
Fig. 320 Input (Turbine) Speed Sensor
1 - INPUT SPEED SENSOR
RS