A/T - Phase II 4EAT Characteristics

SOURCE: Subaru Tech Tips

TITLE: Phase 2 4EAT Transmission Characteristics

APPLIES TO: All models with Phase 2 4EAT A/T

SERVICE TIP:

Phase 2 4EAT transmissions have been used in Subaru vehicles since the 1999 Model Year. They can most readily be identified by the external ATF oil filter located on the driver's side of the transmission case. Be advised that H6 equipped vehicles use a remotely located ATF oil filter. This filter is located in the left front fender well area.

SOA and FHI have been investigating returned OEM transmissions for the last several years. We have been concentrating on units returned that were tested and found not to have any problem during the Dyno testing and disassembly inspection of the unit. Based on the information provided with the returned unit, we have identified several different symptoms that would be considered normal operation for the unit. These characteristic symptoms will not be corrected by replacement of the unit or any components within the system.

It is important to understand that many decisions are made in the designing of the transmission. Items like fuel economy and emissions play a big part in the design. The design of the new 4EAT considerably increases the fuel economy and reduces the overall emissions of the vehicle. To accomplish this, the design incorporates fewer parts than its predecessor. This not only reduces the total friction, but also the overall weight of the unit. Because of this, the unit functions differently than the older 4EAT.

Repairing of a vehicle starts with detailed questioning by the Service Adviser as to how, when, and where the condition occurs. Duplicating the how, when, and where by the technician should enable the concern to be identified. If you are unsure, we recommend you road test a 'like' vehicle. If both vehicles are similar, chances are it is a characteristic of the unit.