Check Lock Hydraulics (Energy Production) - Porsche 928 Workshop Manual

926 Differential, transaxle system
39
Check lock hydraulics (energy production)
General information
The hydraulics comprises the high-pressure pump, solenoid valve, pressure reservoir and supply
tank. The components are located on on a joint bracket in the rear-left wheel housing.
The brake fluid for operating the transverse lock is obtained from the piston reservoir mounted on
the high pressure pump. The operating pressure is between 140 and 180 bar. The pump is activated
via a pressure warning switch.
The solenoid valve familiar from the ABS system controls the functions pressure increase, pressure
maintenance and pressure reduction, and applies pressure to the slave cylinder of the transverse
lock.
Important note
Check hydraulics of the lock (energy production) if "PSD off" appears in the display fields of the in-
strument cluster even though no fault is stored (following pages).
PSD diagnosiflroubleshooting
Printed in Germany - XXXV. 1995
D39 - 247