4-5 Clutch Learn Mode
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
The technician should verify that transmission shift quality for all types of shifts is acceptable prior to releasing the vehicle to the customer.
Following the REVERSE Mode step, the scan tool exits FastLearn, and the only adaptive cells that remain to be learned are the adaptive volume data for the 4-5 clutch. The vehicle must be driven in order to make at least three 3-4 upshifts on the same ignition cycle and at steady throttle position. This data is learned by the TCM intentionally overfilling the 4-5 clutch. Once this overfill is corrected, the 4-5 clutch volume is learned and all special FastLearn actions are completely disabled.