Transmission Adaptive Functions

Transmission Adaptive Functions
The Hydra-Matic 5L40-E 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 Hydra-Matic 5L40-E 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 Indicators and Messages
The following transmission-related indicators and messages may be displayed on the Instrument Panel Cluster (IPC).
Change Transmission Fluid: This illuminates when the TCM determines that the transmission fluid life is less than 10%. Once the TCM determines that the transmission fluid life is greater than 10% the light will go OFF.
Service Transmission: This illuminates when the TCM determines that there is a fault in the transmission.
Arabs Hot Idle Engine": This message is displayed when the TCM detects a Transmission Fluid Temperature (TFT) equal to or greater than 132°C (269°F) for 1 minute.