Hydraulic System

Hydraulic System

Transmission Fluid Filter

The transmission fluid in the sump area at the bottom of the transmission case flows through a transmission fluid filter to the pump assembly. The pump is bolted to the torque converter housing and is driven by the torque converter hub.

Fluid Pump and Transmission Fluid Filter Components









Transmission Fluid Level

The transmission fluid level is checked with the transmission at normal operating temperature between 85°C and 93°C (185°F and 200°F) and the transmission fluid is even with the oil leveling plug hole. Refer to Transmission Fluid Level Check .

Main Control

The hydraulic system has a main control assembly. The main control assembly consists of a valve body and a solenoid body. Both the valve body and the solenoid body contain hydraulic shift valves. The solenoid body contains the shift solenoids that control the hydraulic valves. The solenoid body can be serviced as an assembly with the solenoids or the solenoids can be serviced individually. The solenoid body is controlled by the PCM. The PCM has software stored in it specific to the solenoid body currently in the transmission, called the solenoid body strategy. A new solenoid body strategy must be downloaded into the PCM anytime a new solenoid body is installed.

The pump assembly contains the main pressure regulator valve assembly and the TCC (Torque Converter Clutch) control valve assembly.

Main Control Components










Main Control Valve Body










Solenoid Body














Pump Assembly