Description And Operation
DESCRIPTION
| 1 - EHPS Pump |
There is no internal service of the EHPS module. The EHPS module is integral to the EHPS pump. Replace the EHPS pump as an assembly, including the brackets, and EHPS module.
The EHPS pump is located in front of the right side tire and can be accessed by loosening and positioning aside the right front wheelhouse splash shield.
OPERATION
Multiple modules work together to improve vehicle steering assist at different rates at different speeds. At slow speeds (parking maneuvers) more assist is available and at high speeds less assist is available. The EHPS module uses the Controller Area Network-Chassis (CAN)-C data bus for inputs and outputs of the information necessary for operation. The use of a scan tool is necessary for diagnostics. EHPS module faults are stored in a diagnostic program memory and are accessible with the scan tool. Faults remain in memory until cleared, or until after the vehicle is started approximately 50 times. Stored faults are not erased if the battery is disconnected. For descriptions and procedures related to the appropriate Diagnostic Trouble Code (DTC). Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2)
The EHPS pump assembly contains a control module, brushless electric motor, and hydraulic pump integrated into a single unit. The EHPS pump draws power from the 12 volt electrical system and provides the necessary flow and pressure to the steering gear to provide normal power steering. The output flow of the EHPS Pump is varied as a function of steering wheel rate received from the Steering Angle Sensor (SAS) and vehicle speed received from Anti-Lock Brake System (ABS) module in order to provide the optimum flow of power steering fluid to the steering gear under all operating conditions. The EHPS Pump will start to provide steering assist when the vehicle speed message greater than 5 km/h (3 mph) is received on CAN-C. If the vehicle speed message is missing at vehicle startup, the EHPS Pump will not operate. If the vehicle speed message is lost during operation the EHPS pump will use a default vehicle speed of 85 km/h (59 mph) to calculate desired flow and as a result, steering effort will no longer be speed sensitive. If the steering wheel position message is lost the EHPS Pump will use a default steering wheel rate of 230°/sec to calculate desired flow and as a result, steering effort may be higher on evasive steering maneuvers. The EHPS pump will resume normal operation automatically once any missing message or out of range condition noted above is restored to normal.