Description & Operation: Notes

The 4EAT is a 4-speed transaxle assembly. The 4EAT is controlled by both electronic and mechanical systems. Various sensors and switches allow the 4EAT module to constantly monitor vehicle operating conditions. The 4EAT module is a separate unit on all models except 2.2L non-turbo. On 2.2L non-turbo models, 4EAT module is incorporated with the Electronic Control Assembly (ECA).

Input signals from sensors are sent to 4EAT module and computed to determine gear shift patterns and lockup timing. Four solenoid valves are located on the valve body. Solenoid valves actuate shifting and lockup by switching oil flow through passages within the valve body. The 4EAT module has built-in self-diagnostic capabilities, fail safe operation mode and warning code display for the main input sensors and solenoid valves.

The 4EAT system has self-diagnostic capabilities. Fault codes for faulty engine and transmission sensors, switches and circuits are stored in the memory and may be retrieved to aid diagnosis.

The 4EAT can be operated in manual or automatic shift mode. When the vehicle is started, 4EAT will be in the automatic position. When MAN SHIFT switch is pressed, 4EAT module will activate the manual shift mode. If the MAN SHIFT switch is pressed again or ignition is turned off, manual shift will cancel and automatic shift will be resumed.

Shift timing is also affected by the SHIFT MODE switch which is available on some models. When in the NORM position, shift timing provides for maximum fuel efficiency. When in the POWER position, shift timing provides for maximum acceleration.