Electronic Control System

Electronic Control System

Electronic Control

The electronic control system consists of the powertrain control module (PCM), sensors, switches, and solenoid valves. Shifting is electronically controlled for comfortable driving under all conditions.

The PCM receives input signals from the sensors, switches, and other control units, processes data, and outputs signals for the engine control system and the CVT control system. The CVT control system includes shift control, pulley pressure control, start clutch pressure control, and reverse inhibitor control. The PCM actuates the pulley control solenoids to control pulley control valves A and B shifting transmission pulley ratios.





Pulley Pressure Control/Shift Control

To reduce belt slippage and increase belt life, the PCM calculates signals from the sensors and switches, and actuates the pulley pressure control solenoid valves to maintain optimum pulley pressure. When the pulley ratio is low (low vehicle speed), high hydraulic pressure works on the movable face of the driven pulley and reduces the effective diameter of the driven pulley, and a lower hydraulic pressure works on the movable face of the drive pulley to eliminate the steel belt slippage. When the pulley ratio is high (high vehicle speed), high hydraulic pressure works on the movable face of the drive pulley and reduces the effective diameter of the drive pulley, and a lower hydraulic pressure works on the movable face of the driven pulley to eliminate the steel belt slippage.

The PCM compares actual driving conditions with programmed driving conditions to control shifting, and it instantly determines a drive pulley ratio from various signals sent from sensors and switches. The PCM activates the CVT drive pulley pressure control valve to control pulley pressure to the pulleys. The drive pulley drives the driven pulley via a steel belt at varying ratios ranging from 2.526 to 0.421 in D.





Start Clutch Pressure Control

The hydraulic-controlled start clutch controls smooth starting-off and creeping in D, S, L, and R like a torque converter. The PCM inputs signals from the sensors, and switches, and actuates the start clutch pressure control valve to regulate the clutch reducing pressure, and the clutch reducing pressure controls the start clutch.

PCM CVT Control System Electrical Connections ('06 Model):

PCM CVT Control System Electrical Connections ('07-08 Models):

PCM CVT Control System Inputs and Outputs

PCM CVT Control System Inputs And Outputs (Part 1):

PCM CVT Control System Inputs And Outputs (Part 2):

PCM CVT Control System Inputs And Outputs (Part 3):

PCM CVT Control System Inputs And Outputs (Part 4):