Porsche 928 Workshop Manual page 1268

39
Differential, transaxle system 920
Fault, DTC Possible causes, remedy, notes
Test point
1
Transverse lock valve
DTC tl
No feedback signal from valve to control unit.
1. Switch off the ignition. Pull the plug off the control unit.
Check that circuits at plug are not interrupted.
PIN 21 to PIN 23
PIN 21 to PIN 17
If necessary, interrupt the wiring path (plug on transverse lock
solenoid valve) and localize the discontinuity by reference to the
wiring diagram.
2. Pull off valve relay (No. 1) on the hydraulic unit. (Remove wheel
housing cover at the front-lefl side),
Check for a short circuit to plus or ground in the wiring path, as
described in point 1, by measuring at PIN 21.
If there is a fault in the wiring path, separate it as described in
point 1 so that the unwanted connection to the positive or nega-
tive side can be located.
D39 - 230
a
PSD diagnosis/Troubleshooting
Printed in Gemuny - XXXV, IS96