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. 22),
an AC voltage is generated and sent to the TCM. The
TCM interprets this information as input shaft rpm.
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
OUTPUT SPEED SENSOR
DESCRIPTION
The Output Speed Sensor is a two-wire magnetic
pickup device that generates an AC signal as rotation
occurs. It is threaded into the transaxle case (Fig.
23), sealed with an o-ring (Fig. 24), and is considered
a primary input to the Transmission Control Module
(TCM).
OPERATION
The Output Speed Sensor provides information on
how fast the output shaft is rotating. As the rear
planetary carrier park pawl lugs pass by the sensor
coil (Fig. 25), an AC voltage is generated and sent to
the TCM. The TCM interprets this information as
output shaft rpm.
The TCM compares the input and output speed
signals to determine the following:
• Transmission gear ratio
• Speed ratio error detection
• CVI calculation
VEHICLE SPEED SIGNAL
The vehicle speed signal is taken from the Output
Speed Sensor. The TCM converts this signal into a
pulse per mile signal and sends it to the PCM. The
PCM, in turn, sends the vehicle speed message
across the PCI Bus to the BCM. The BCM sends this
Fig. 22 Sensor Relation to Input Clutch Hub
1 – INPUT SPEED SENSOR
2 – TRANSAXLE CASE
3 – INPUT CLUTCH HUB
Fig. 23 Output Speed Sensor Location
1 – INPUT SPEED SENSOR
2 – OUTPUT SPEED SENSOR
3 – IDENTIFICATION TAG
Fig. 24 O-Ring Location
1 – OUTPUT SPEED SENSOR
2 – O-RING
LH 42LE TRANSAXLE 21 - 17
DESCRIPTION AND OPERATION (Continued)
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