Functional Operation

FUNCTIONAL OPERATION
The 40/41TE electronic transaxle has a fully adaptive control system. The system performs its functions based on continuous real-time sensor feedback information. The control system automatically adapts to changes in engine performance and friction element variations to provide consistent shift quality. The control system ensures that clutch operation during upshifting and downshifting is more responsive without increased harshness.

The control module continuously checks for electrical problems, mechanical problems, and some hydraulic problems. When a problem is sensed, the control module stores a diagnostic trouble code. Some of these codes cause the transaxle to go into Limp-in or default mode. While in this mode, electrical power is removed from the transaxle, deenergizing the transmission control relay, and solenoid pack. When this happens, the only transaxle mechanical functions are:

- Park and Neutral
- Reverse
- Second Gear

No upshifts or downshifts are possible. The position of the manual valve alone allows the three ranges that are available. Although vehicle performance is seriously degraded while in this mode, it allows the owner to drive the vehicle in for service.

Once the DRBIII is in the Transmission portion of the diagnostic program, it constantly monitors the control module to see if the system is in Limp-in mode. If the transaxle is in Limp-in mode, the DRBIII will flash the red LED.