Block Diagram
CAN abbreviations
| 15 | Ignition ON (terminal 15) | 31 | Ground (terminal 31) |
|---|---|---|---|
| 30 | Battery positive (terminal 30) |
Function Table
| Terminal | Description | Source | Destination |
|---|---|---|---|
| X1-1 | Ignition ON (terminal 15) | UEC | EHPS |
| X2-2 | Ground (terminal 31) | Ground | EHPS |
| X2-1 | Battery positive (terminal 30) | Battery | EHPS |
| X1-2 X1-3 HSCAN | Actuation of the EHPS telltale in the case of a fault and optionally an oil level warning in the instrument | EHPS | CIM |
| X1-2 X1-3 HSCAN | Input of the "Engine running" status and possible alternator error message | ECM | EHPS |
| X1-2 X1-3 HSCAN | Input of vehicle speed; the hydraulic pump speed is controlled depending on the vehicle speed | ECM | EHPS |
| X1-2 X1-3 HSCAN | Input of current ignition key position and network monitoring | CIM | EHPS |
| X1-2 X1-3 HSCAN | Input steering wheel movement; the hydraulic pump speed is controlled depending on the steering wheel rotation speed (ESP) | CIM | EHPS |
Functional Description
Actuation of the Hydraulic Pump
The speed of the hydraulic pump is controlled in accordance with the speed of the steering wheel movement and the vehicle speed (calculated in the ECM).
Steering Angle Sensor
In vehicles without ESP, only the system's own steering angle sensor (inductive sensor in steering gear) is used. The option of receiving the steering angle sensor status via HSCAN bus is only used in conjunction with ABS/ESP.