Mitsubishi Eclipse Technical Information Manual page 192

POWER TRAIN - Automatic Transaxle
Pressure Switches
Solenoid and
The low/reverse, overdrive, and 2-4 pressure switches are
all located in the solenoid pack assembly. All three switches
send the same type of information to the TCM. These switches
tell the TCM if there is hydraulic pressure in their particular
circuits. The pressure switches do not tell the TCM how much
pressure is in the circuit. They just indicate that pressure exists
or does not exist. This information verifies that the solenoids
are operating correctly and what gear the transaxle is in. The
switches open at approximately 11 psi and close at approximate-
ly 23 psi.
Engine Coolant Temperature Sensor
This engine coolant temperature sensor tells the TCM the tem-
perature of the engine. When the engine is cold, the TCM
may delay upshifts slightly to improve vehicle driveability. The
TCM prevents the torque converter clutch from engaging until
the engine warms up to normal operating temperature. If the
engine temperature is too high in any forward position, the
TCM engages the torque converter clutch in second, third,
or fourth gears to help cool the engine and prevent the transaxle
from overheating.
Brake Switch
The brake switch signal is used to make sure the torque convert-
er clutch is disengaged when the brakes are applied. It is
also used to cancel cruise control so that braking can occur.