Valve Relay Dtc 34 - Porsche 928 Workshop Manual

920
Differential, transaxle system
39
a
Fault, DTC Possible causes, remedy, notes
Test point 13
Valve relay
DTC 34
Certain faults in the ABS valve area (short circuit to plus or short circuit
to ground in a control wire) may also be shown as
valve relay faults
by
the 9286 system tester.
A fault in the ABS valve circuit is normally stored as an
ABS valve fault
in the DTC memory of the control unit.
In the case described above, when the DTC memory is read out the
display of
two faults is possible (ABS valve and valve relay).
1. Switch off the ignition. Pull off the control unit plug.
Check the control circuit (wire with relay) - from PIN 20 to PIN 7 - for
any discontinuity, short circuit to ground and shod circuit to plus.
lf no fault is found, proceed with 2.
If there is a discontinufty, short circuit to plus or short circuit to
ground, pull off the valve relay. Check the wires between terminal 85
on the relay base and PIN 7 on the control unit plug and between ter-
minal 66 and PIN 20.
If the wires are in working order, replace the valve relay.
a
PSD diagnosis/Troubleshooting
Printed in Germany - XXXV, I666
039 - 241