4F27E - General Reference Data Trans Basic Operation: Clutch / Band / Solenoid Application Chart
Pressure control and shifting are controlled
Range Reverse Forward 2-4 Direct Low/Rev Low SSA SSB SSC SSD SSE PCA
by the computer system sending signals to
Position Clutch Clutch Band Clutch Clutch One-Way
solenoids mounted on the valve body.
Various sensors provide data to computer Park V
OSS Resistance
800-920 room temp for decision making. This is a 4 speed unit Reverse Applied Applied V
Located next to Axle. with a Torque Converter Clutch. 4th gear
Neutral V
TSS Resistance can be inhibited using transmission control
330-390Ω room temp switch. (OD Cancel). Overdrive Applied Locked On On V
1st Speed
Overdrive Applied Applied # # On V
2nd Speed
Overdrive Applied Applied # # V
3rdSpeed
Cooler
Overdrive Applied Applied On # On V
Supply 4thSpeed
Manual 2 Applied Applied On V
Manual Low (1) Applied Applied Locked On On On V
Cooler Solenoid Resistance in Ohms 10.9 - 26.2 1.0 - 4.2 2.4 - 7.3
Return
# = On for TCC V= Varies under PCM Calibration Currently there are 3 final drive ratios 3.68, 3.91, 4.15.
Servo
Release
Pump Converter Converter Forward Pump 1-2
Suction Front Rear Clutch Output Accum
Line
Pressure
Lube
Line Pressure
SSA
Selector Idle Stall
Reverse 65-85 280-335 SSD
N-D
D21 50-65 180-210 SSC Accum
Low
Reverse
SSB
EPC Servo
Release
TFT
Servo
SSE EPC Apply
TFT (-)
Rev Direct
L/R Hub/Ring Gear Toward Converter Input Clutch
turn Counter Clockwise © TransGo 2006
