Vauxhall Workshop Service and Repair Manuals

Electro-Hydraulic Power Steering (EHPS)  

All Astra-G models are equipped as standard with the new E lectro- h ydraulic P ower S teering (EHPS).  

The EHPS components are installed as one compact unit with the steering gear on the front axle body.  

Notice: 

The electro-hydraulic power steering systems are built by two different suppliers. The main distinguishing feature is the shape of the fluid reservoir.  

- Round fluid reservoir:

TRW

- Rectangular fluid reservoir:

Delphi

5.1   Electro-Hydraulic Power Steering (EHPS) (continued)  

1  Electro-hydraulic supply unit  

2  Return line  

3  Pressure line  

4  Wiring harness for electro-hydraulic supply unit  

5.1   Electro-Hydraulic Power Steering (EHPS) (continued)  

The electro-hydraulic power steering has the following advantages compared to conventional power steering:  

•  Savings in fuel consumption  

•  Weight reduction thanks to compact design  

•  Hydraulic system decoupled from engine  

 

The electro-hydraulic supply unit consists of the following components:     1  Fluid reservoir with dipstick   2  Resonator and pressure limiting valve   3  Pump unit (gear pump)   4  Maintenance-free electric motor without brushes   5  Motor housing   6  Control electronics     • Service   The electro-hydraulic supply unit must not be opened. If a malfunction occurs, the complete unit must always be replaced.   Removal and installation is described in the "Astra-G Service Instructions, group M".   The EHPS system does not have a diagnostic interface.