PD78: Transaxle Shift Adapt

Transaxle Shift Adapt. Display shows pounds per square inch (PSI) from -128 to +127. This value is the increase (+) or decrease (-) in transaxle line pressure that the PCM is commanding through the transaxle pressure control solenoid during the most recent upshift or downshift.

The PCM increases or decreases the line pressure during shifts to control shift feel. A normal value is between -10 PSI and +10 PSI. A value less than 0 PSI means the PCM was lowering transaxle line pressure during the most recent shift to soften the shift. A value greater than 0 PSI means the PCM was raising transaxle line pressure during the most recent shift to firm up the shift.