Porsche 928 Workshop Manual page 1269

926 Differential, transaxle system
39
Fault, DTC Possible causes, remedy, notes
"i~:.~easra~~o~~amo~~e~~~f,t~o~~~o~s~~ob~-~e~
For this purpose, disconnect the plug connection on the trans-
verse lock solenoid valve (armw). The transverse lock solenoid
valve is located beneath the rear lefl wheel housing cover.
Nominal value X.4 R
between the PINS on the valve block.
Nominal value not OK: Replace the transverse lock solenoid valve.
4. Check that the valve relay is energized (voltage present at so-
lenoid valves of ABS and PSD).
Connect all plugs and the relay for this purpose. Push back the
protective tube on the transverse lock valve plug (in the wheel
housing on the rear lefl).
Switch off the ignition, then switch k on again,
Battery voltage must be present at the black wire.
If
no
battery voltage is present: Continue with test point 13/DTC
34 (valve relay). Note testing instructions (see below).
If voltage is present, by replacing the PSD/ABS control
unit (output stage defedive).
Notes on testing
If a plug for the power supply to the solenoid valves (ABS or differen-
tial lock) is detached while the ignition is switched on, the valve relay
is de-energized. Even if the plug is then reconnected, the relay will
not be re-energized until the ignition has been switched off and on
again.
PSD diagnosismroubleshooting
Prtrhd in Germany - xxxv. 1886
D39 - 234