Shift Control

The PCM instantly determines which gear should be selected by various signals sent from sensors and switches, and it actuates the shift solenoid valves A, B, C, and E to control shifting.

Also, a grade logic control system has been adopted to control shifting in the D position. The PCM compares actual driving conditions with memorized driving conditions, based on the input from the throttle 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.

Fig 1: Shift Control Functional Diagram

Courtesy of AMERICAN HONDA MOTOR CO., INC.

The PCM turns the shift solenoid valves A, B, C, and E ON and OFF to control shifting of the transmission. The combination of driving signals to shift solenoid valves A, B, C, and E are shown in table.