allows reasonably normal transmission operation
with a TRS failure.
TRANSMISSION TEMPERATURE SENSOR
The TRS has an integrated thermistor (Fig. 19)
that the TCM uses to monitor the transmission’s
sump temperature. Since fluid temperature can
affect transmission shift quality and convertor lock
up, the TCM requires this information to determine
which shift schedule to operate in. The PCM also
monitors this temperature data so it can energize the
vehicle cooling fan(s) when a transmission “overheat”
condition exists. If the thermistor circuit fails, the
TCM will revert to calculated oil temperature usage.
CALCULATED TEMPERATURE
A failure in the temperature sensor or circuit will
result in calculated temperature being substituted for
actual temperature. Calculated temperature is a pre-
dicted fluid temperature which is calculated from a
combination of inputs:
• Battery (ambient) temperature
• Engine coolant temperature
• In-gear run time since start-up
SHIFT POSITION INDICATOR
DESCRIPTION
The shift position indicator is located in the instru-
ment cluster. It indicates the position of the manual
valve lever by illuminating an LED located under the
P, R, N, D, 3, or L (or Autostick) gear symbol.
OPERATION
The Transmission Range Sensor (TRS) sends a sig-
nal to the Transmission Control Module (TCM)
regarding the position of the manual valve lever. The
TCM converts this signal into a Shift Lever Position
(SLP) and sends the information to the BCM (Body
Control Module) and the instrument cluster.
Refer to Group 8E, Instrument Panel And Gauges
for repair procedures.
INPUT SPEED SENSOR
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.
20), sealed with an o-ring (Fig. 21), and is considered
a primary input to the Transmission Control Module
(TCM).
TRS SWITCH STATES
SLP T42 T41 T3 T1
P CL CL CL OP
R CL OP OP OP
N CL CL OP CL
OD OP OP OP CL
3 (AS) OP OP CL OP
L CL OP CL CL
Fig. 20 Input Speed Sensor Location
1 – INPUT SPEED SENSOR
2 – OUTPUT SPEED SENSOR
3 – IDENTIFICATION TAG
Fig. 21 O-Ring Location
1 – INPUT SPEED SENSOR
2 – O-RING
21 - 16 42LE TRANSAXLE LH
DESCRIPTION AND OPERATION (Continued)
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