Parts Affected and How to Identify Differences

Automatic Transaxle Control Body Assembly (Valvebody)














The automatic transaxle control body assembly (called the valvebody in this bulletin) has been completely redesigned. Major changes include the elimination of the TCC enable valve, actuator feed mode valve, and the line boost plunger. The spacer plate and gaskets have also been redesigned along with the manual valve. A servo apply valve has been added (operation described below). Refer to Figures 2 through 5 for exploded views of both types of valvebodies. Figure 5 will indicate the location of an identification mark for the 2nd design valvebody.

Torque Converter Clutch (TCC) Enable Valve

The torque converter clutch (TCC) enable valve has been eliminated in the new design. This valve was used primarily to disable TCC when in P, N, manual D2 and 1st gear. By disabling the TCC in these quadrants, the vehicle can still be driven forward with a TCC stuck ON condition. Logic has been added to the PCM (powertrain control module) to detect a TCC stuck ON condition, so the TCC valve is no longer required. Elimination of the valve simplifies the valvebody.

Actuator Feed Mode Valve

The actuator feed mode valve has also been eliminated to simplify the system. The elimination of this valve will only have an affect when certain conditions are detected by the PCM. On transaxles built before this change, if a certain condition exists, the PCM will detect the condition and illuminate the "SHIFT TO D2" lamp. When the driver selects manual D2, the system will go to boost pressure and allow a 2nd gear start. When selecting D2 on the new system, the vehicle may start out in any forward gear depending on the failure condition. Elimination of this valve simplifies the valvebody.

Line Boost Plunger

The line boost plunger, located in the pressure regulator valve, has also been eliminated. Line pressure is now totally controlled by the PCM, line actuator and the line pressure regulator.