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NOTE: It is important that this procedure be performed when the transmission temperature is between 80 - LEARN A SMOOTH NEUTRAL TO DRIVE GARAGE SHIFT Perform this procedure if the complaint is for a delayed or harsh shift when the transmission is put into gear after NOTE: The transmission oil temperature must be between 80 - 110°F (27 - 43°C) to learn the UD CVI. Addi- 1. Start the vehicle engine and shift to drive. 2. Move the vehicle forward to a speed of at least 16 km/h (10 MPH) and come to a stop. This ensures no air is present in the UD hydraulic circuit. 3. Perform repeated N-D shifts at a stop while pausing in Neutral for at least 2-3 seconds and monitor Norm N-D UD CVI volume until the value stabilizes. The value will change during the N-D shift. This is normal since the UD LEARN THE 1ST 2-3 SHIFT AFTER A RESTART OR SHIFT TO REVERSE Use the following steps to have the TCM learn the 1st 2-3 shift OD CVI. NOTE: The transmission oil temperature must be above 80°F (27°C). 1. With the vehicle engine running, select reverse gear for over 2 seconds. 2. Shift the transmission to Drive and accelerate the vehicle from a stop at a steady 15 degree throttle opening and perform a 2-3 shift while noting the 1st 2-3 OD CVI. 3. Repeat Step 1 and Step 2 until the 1st 2-3 upshift becomes smooth and the 1st 2-3 OD CVI stabilizes. LEARN A SMOOTH 2-3 AND 3-4 UPSHIFT NOTE: The transmission oil temperature must be above 110°F (43°C). Use the following steps to have the TCM learn the OD and 4C CVI’s. 1. Accelerate the vehicle from a stop at a steady 15 degree throttle opening and perform multiple 1-2, 2-3, and 3-4 upshifts. The 2nd 2-3 shift following a restart or shift to reverse will be shown during the shift as a value between 2. Repeat Step 1 until the 2-3 and 3-4 shifts become smooth and the OD and 4C CVI become stable. LEARN A SMOOTH 4-3 COASTDOWN AND PART THROTTLE 4-3 KICKDOWN NOTE: The transmission oil temperature must be above 110°F (43°C). Use the following steps to have the TCM learn the UD shift volume. 1. At a vehicle speed between 64-97 km/h (40-60 MPH), perform repeated 4-3 kickdown shifts. 2. Repeat Step 1 until the UD volume becomes somewhat stable and the shift becomes smooth. 8E - 184 ELECTRONIC CONTROL MODULES - SERVICE INFORMATION ND |