Porsche 928 Workshop Manual page 1283

920
Differential. transaxle svstem
39
Fault, DTC Possible causes, remedy, notes
Test point 14
Return pump,
DTC 35
1. Switch off the ignition. Pull off the plug at the control unit. Check
control circuk (wire with relay) - PIN 20 to PIN 5 - for discontinuity
and short circuit to groundtto plus.
If no fault is found, proceed with 2.
If there is a discontinuity, short circuit to plus or to ground, pull off
the motor relay. Check wiring between terminal 65 at the relay base
and PIN 5 on the control unit plug, and between terminal 66 and
PIN 20.
If the wiring is in working order: Replace the motor relay
2. Pull off the motor relay. Battery voltage (appmx. 12 Volt) must be
present at terminal 67 of the relay base.
3. Bridge terminals 30 and 87 at the relay base.
If
the return pump does not run, continue wYh 4.
If the return pump runs:
Check wire from terminal 30 on the relay base to PIN 31 at the con-
tml unit plug. If the wire is in working order: Replace the motor relay.
PSD diagnosis/Troubleshooting
Printed in Germany - XXXV.
1996
D39 - 249