Transaxle Description

Transaxle Description





The automatic transmission used in the vehicle is a new development.
It is a fully automatic, electronically controlled four-speed transmission designed for front-wheel-drive vehicles. Its abbreviated designation 4F27E means:
- 4-4-four-speed transmission
- F-front wheel drive
- 27-originally designed for maximum input torque after torque converter: 365 Nm (270 ft. lbs.)
- E-fully electronic control
The individual ratios are achieved through two planetary gear sets, connected one behind the other.

The individual components of the planetary gear sets are driven or held by means of three multiplate clutches, a multiplate brake, a brake band and a roller one-way clutch.

The torque is transmitted to the final drive assembly through an intermediate gear stage. MERCON(R) V is the fluid specified for the 4F27E transmission. The fluid is changed as directed by the Scheduled Maintenance Guide that is supplied with the vehicle.

The manual selector lever gives the driver a choice of "P", "R", "N", "1", "2" and "D".

In drive range "D" it is also possible to operate an O/D switch on the manual selector lever to prevent the transmission from shifting into fourth gear. The default gear for this transmission is third gear.

To minimize fuel consumption, the torque converter lock-up clutch is closed by the PCM in 3rd and 4th gears depending on the throttle position and vehicle speed.

The transmission has electronic synchronous shift control (ESSC), which guarantees extremely smooth gear shifting over the entire life of the transmission.

A hydraulic emergency operating program maintains limited operation in the event of failure of important electrical components.





The transmission can be tested using FDS2000, NGS or WDS through the data link connector (DLC) in the Passenger compartment.