GM Service Manual Online
For 1990-2009 cars only

A vane-type constant displacement pump provides the hydraulic pressure for the system. The 4.6L engine uses a TC series pump.

The following list identifies the major components of the power steering pump:

    • The drive shaft
    • The pump housing
    • The pump ring
    • The pressure plate
    • The thrust plate
    • The control valve
    • The rotor and vane assembly

The reservoir is separate from the housing and internal components.

In order to limit the pump pressure, this system uses a pressure relief valve.