Subaru 2002 Impreza Service Manual page 230

ELECTROHYDRAULIC CONTROL SYSTEM
Automatic Transmission
H: ATF TEMPERATURE SENSOR
This sensor is located in the hydraulic control valve of the transmission. It detects the temperature
of ATF and outputs it as an electrical resistance signal. The output characteristics of the sensor
are shown below.
t
0)
m
( I )
(I)
2
2
4 - 4
._
Temperature
-
NF0071
--
-
(1) ATF temperature sensor
I: TORQUE CONVERTER TURBINE SPEED SENSOR
The torque converter turbine speed sensor (output shaft speed sensor) is externally mounted on
the transmission case.
The sensor detects the torque converter turbine speed in terms of the rotation speed of the periph-
ery of the high clutch drum coupled to the input shaft, and sends sine wave signals (32 pulses per
rotation) to the TCM. The TCM calculates the proportion of the input shaft speed to the vehicle
speed and determines whether the shifting is to be made or not.
NF0072
(1 ) Torque converter turbine speed sensor
AT-8