Shift Control - Grade Logic Control

The grade logic control system is used to control shifting in D, D3 (seven-position transmission), and S with automatic shift mode (five-position transmission). The PCM compares actual driving conditions with programmed driving conditions, based on the input from the throttle position sensor, the accelerator pedal position sensor, the engine coolant temperature sensor, the barometric pressure sensor, the brake pedal position switch signal, and the shift lever position signal, to control shifting while the vehicle is ascending or descending a slope.