Circuit Description
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) system uses the Phase A and Phase B signal inputs from the steering wheel sensor for proper operation. The steering wheel sensor outputs Phase A and Phase B signals to the EHPS system that are 90 degrees out of phase to provide quadrature pulsed data corresponding to steering shaft rotational displacement and direction. The signal is resolved to within 1 mechanical degree of resolution. The EHPS system monitors the steering wheel rate information from the steering wheel sensor every 5 milliseconds (200 Hz) for proper operation.