Power Steering System Description and Operation (w/ Electro-Hydraulic Steering): Notes
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The electro-hydraulic power steering (EHPS) module controls the power steering motor which has the function of providing hydraulic power to the brake booster and the steering gear. A secondary function includes the ability to improve fuel economy by operating on a demand basis and the ability to provide speed-dependent variable-effort steering.
The EHPS module controls the EHPS powerpack, an integrated assembly consisting of the following components:
- The electric motor
- The hydraulic pump
- The fluid reservoir
- The reservoir cap
- The reservoir baffles, if required
- The fluid level sensor, if required
- The electronic controller
- The electrical connectors