Transmission Component and System Description
Transmission Component and System DescriptionThe mechanical components of the AF33-5 are as follows:
^ Torque converter assembly
^ Forward (C1) and direct (C2) clutch assembly
^ Rear sun gear assembly
^ Rear internal gear
^ Front sun gear
^ Front carrier assembly
^ Front internal gear and low clutch sprag (F2) assembly
^ Low and reverse clutch plates and disc assembly (B3)
^ Output gear assembly
^ Second coast clutch and second clutch hub and second clutch sprag (F1) assembly
^ Automatic transmission fluid pump, second coast clutch (B1) and second clutch (B2) assembly
^ 1-2 reverse clutch (B5) assembly
^ 1-2 reverse internal gear
^ 1-2 reverse carrier gear assembly
^ 3rd gear band assembly (B4)
^ 3rd gear band servo piston assembly
^ 4-5 clutch (C3) assembly
^ front differential transfer drive gear assembly
^ front differential assembly
^ Automatic transmission control valve body assembly
The electrical components of the AF33-5 are as follows:
^ Automatic transmission output speed sensor (OSS) assembly
^ Automatic transmission input speed sensor (ISS) assembly
^ Reverse, 1st shift solenoid valve assembly (S1) - black
^ 2-3, 3-4 shift solenoid valve assembly (S2) - black
^ 1-2, 2-3, reverse shift solenoid valve assembly (S3) - dark gray
^ 3-4, 4-5 shift solenoid valve assembly (S4) - blue
^ Reverse shift solenoid valve assembly (S5) - brown
^ Line pressure control solenoid valve assembly (SLT) - blue
^ Lock up pressure control solenoid valve assembly (SLU) - black
^ Shift pressure control solenoid valve assembly (SLS) - green
^ Automatic transmission fluid temperature (TFT) sensor
^ Transmission control module (TCM).
Transmission Adaptive Functions
The AF33-5 uses a line pressure control system which has the ability to adapt the system line pressure in order to compensate for normal wear of clutch fiber plates, seals, springs, etc. The adapt feature is similar in function to fuel control (integrator/block learn). The AF33-5 transmission uses the adapt function for garage shifts, upshifts, and TCC application. The TCM monitors the input shaft speed in order to determine if the shift is occurring too fast or too slow and adjusts the pressure control solenoid in order to maintain the correct shift feel.
Transmission Oil Life Monitor
Transmission fluid life is determined by monitoring transmission fluid temperature over a period of time. The transmission control module (TCM) calculates transmission fluid life based on a set of temperature ranges stored in TCM memory. A counter increments as the vehicle is driven. The rate at which the counter increments, depends on the temperature range in which the transmission is currently operating. The higher the temperature range, the faster the counter increments. As the counts increment, the TCM will begin to decrease the fluid life percentage from 100, high fluid life, to 0, low fluid life. When the transmission fluid needs to be changed a DTC P0897 will set and turn on the service vehicle soon (SVS) light. The fluid life percentage can be reset with the scan tool.