Transmission Adaptive Functions

The PCM maintains the following adapt parameters for the transmission:

• Upshift Adapt  - The PCM monitors the Automatic Transmission Input Shaft Speed Sensor (AT ISS) and the Vehicle Speed Sensor (VSS) during commanded shifts to determine if a shift is occurring too fast or too slow. The PCM adjusts the signal to the transmission pressure control solenoid valve to maintain a set shift feel.
• Steady State Adapt  - The PCM monitors the Automatic Transmission Input Shaft Speed Sensor (AT ISS) and the Vehicle Speed Sensor (VSS) after a shift and the PCM calculates the amount of slippage in that gear. The PCM then adjusts the signal to the transmission pressure control solenoid valve to maintain slippage below a set amount.