Transaxle Description

The CD4E automatic transaxle is a four-speed, front wheel drive automatic transaxle with electronic controls for:

• Electronic pressure control (EPC) solenoid for shift quality.
• Shift scheduling.
• 3-2 shift timing.
• Coast braking.
• Torque converter clutch control.
  Fig 1: View Of Transaxle

  Courtesy of MAZDA MOTORS CORP.

The transaxle features a four element torque converter with a torque clutch and a geartrain that includes:

• Compound planetary gearset.
• Chain drive.
• Planetary gearset final drive.
• Pinion and side gear differential.

The hydraulic control system of the transaxle has five solenoids that control:

• Shift feel, through line pressure control.
• Shift scheduling, through shift valve positioning control.
• Modulated application of the torque converter clutch.
• Timing of 3-2 shifts.
• Engine braking during coast operation.