With EHPS
There is an Electro-Hydraulic Power Steering (EHPS) pump on some vehicles requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The mechanical power steering pump systems on this vehicle require the use of Power Steering Fluid +4, which meets material specification MS-9602 or equivalent. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.
The EHPS system consists of:
- Steering column and Intermediate Shaft
- Rack and pinion steering gear
- EHPS pump (3.6L) (3)
- Pump pressure (5) and supply/return line assembly (1, 2)
- Remote power steering reservoir (The EHPS reservoir has only one hose connection)
- Some early built vehicles with EHPS do not have a power steering system cooler effecting the power steering line/hose configuration.
Power assist is provided by the EHPS pump (3) mounted to the cradle in front of the engine. The EHPS pump is an electrically operated hydraulic pump which supplies variable hydraulic fluid flow and pressure to the steering gear. The EHPS pump replaces the conventional belted power steering pump. The EHPS pump has an EHPS module attached (not replaceable separately). There are two electrical connectors (6) on the EHPS pump assembly (3). One connector is a 12 volt low amperage module connector, and the other is a 12V higher amperage pump connector containing a larger gauge wire for motor operation. The power steering hoses and steering gear are substantially unchanged in function from a conventional system. However, there are unique components for this system, such as hoses for routing and the gear for valve tuning.