Disconnect the connector from the power steering valve.
Pic. 14.26. Power Steering Valve Connector Pin Arrangement
Connect wire «masses» to contact «GR» (pic. 14.26). If all electrical consumers are turned off, the engine idle speed should be 950–1050 min-1. Otherwise, adjust the valve by turning the adjusting screw.
Turn off the engine, connect the connectors and remove the tachometer.