Electric Hydraulic Power Steering (EHPS) Pump
| Refer to COMPONENT INDEX . |
Power assist is provided by the EHPS pump mounted above the right front frame rail forward 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 on the EHPS pump assembly. One connector is a 12 volt low amperage module connector, and the other is a 12 volt higher amperage pump connector containing 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.
The EHPS provides the following signals:
CAN-C Inputs
- Vehicle speed
- System voltage
- Commanded ignition switch status
- Propulsion system active
- Stop start feature present
- Engine Stop Start (ESS) engine state
- Steering module configuration
- Delta steering wheel angle
- Steering wheel angle
- Steering wheel angle precision
- Network configuration status
- Electric power steering configuration
- BCM Present / Not Present
- PCM Present / Not Present
- Anti-lock brake system module Present / Not Present
- IPC Present / Not Present
- SCCM Present / Not Present
- Hybrid control processor Present / Not Present
CAN-C Outputs
- Electric power steering assistance status
- Electric power steering warning display request
- Power steering system type
- Electric power steering current
- Power steering system type
- Engine fan activation request for cooling