Procedure To Learn A Smooth Neutral To Drive Garage Shift
WARNING: This page does not describe the selected car, but rather 120 other vehicles, including the 2002 Saturn Vue, 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, and 2002 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
It is important that this procedure be performed when the transmission fluid temperature is between 80-110°F (27-43°C). If this procedure takes too long to complete fully for the allowed transmission fluid temperature, the vehicle may be returned to the customer with an explanation that the shift will improve daily during normal vehicle usage. TCM also learns at higher fluid temperatures, but these values (line pressure correction values) are not available for viewing on the DRBIII®.
NOTE:
The transmission fluid temperature must be between 80-110°F (27-43°C) to learn the UD CVI. Additional learning occurs at temperatures as low as 0°F (-17°C) and as high as 200°F (94°C). This procedure may be performed at any temperature that experiences poor shift quality. Although the UD CVI may not change, shift quality should improve.
Perform this procedure if the complaint is for a delayed or harsh shift when the transmission is put into gear after the vehicle has had its first shift. Use the following steps to have the TCM learn the N-1 UD Clutch Volume Index (CVI).
- Start the engine and shift to Drive.
- Move the vehicle forward to a speed of at least 10 MPH and come to a stop. This ensures no air is present in the UD hydraulic circuit.
- Perform repeated N-1 shifts at a stop while pausing in Neutral for at least 2-3 seconds and monitor UD CVI volume until the value stabilizes. The value will change during the N-D shift. This is normal since the UD value is different for the N-1 shift than the normal value shown, which is used for 4-3 coastdown and kickdowns. Perform repeated shifts in this temperature range until the UD CVI value stabilizes and the N-1 shifts become smooth.
- This procedure may be performed at any temperature that experiences poor N-1 shift quality. Although the UD CVI may not change, shift quality should improve.