INSTALLATION
1. Install the input speed sensor (3) into the transmis-
sion case.
2. Install the bolt to hold the input speed sensor (3)
into the transmission case. Tighten the bolt to 11.9
N·m (105 in.lbs.).
3. Install the wiring connector onto the input speed
sensor.
4. Verify the transmission fluid level. Add fluid as nec-
essary.
5. Lower vehicle.
SENSOR-LINE PRESSURE
DESCRIPTION
The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force
style solenoid, the Pressure Control Solenoid, mounted on the side of the solenoid and pressure switch assembly.
The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump
back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a
direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feed-
back loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to
achieve the desired line pressure.
OPERATION
The TCM calculates the desired line pressure based upon inputs from the transmission and engine. The TCM cal-
culates the torque input to the transmission and uses that information as the primary input to the calculation. The
line pressure is set to a predetermined value during shifts and when the transmission is in the PARK and NEUTRAL
positions. This is done to ensure consistent shift quality. During all other operation, the actual line pressure is com-
pared to the desired line pressure and adjustments are made to the pressure control solenoid duty cycle.
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AUTOMATIC TRANSMISSION - 545RFE - SERVICE INFORMATION
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