Porsche 928 Workshop Manual page 1273

928
Differential, transaxle system
39
Fault, DTC Possible causes, remedy, notes
Test point 5
Control unit defedive
DTC 15
Before replacing the control unit, check whether:
- there is any electrical interference from the ignition voltage (for ex-
ample, if the spark plug caps are not correctly attached)
- them are any differences in potential caused by contact resistance
(missing or poor ground connections).
Important:
A poor ground connection may occur not only at the affected compo-
nents but also at other important grounding points.
- ground contact is present at control unit plug PINS 3, 52 and 37.
These wires are connected to ground point IV or V (at the steering
console in the case of left-hand drive vehicles I over the central
electrical system in the case of right-hand drive vehicles).
Important
When replacing the PSD/ABS control unit, make sure that if is not
confused with the PDAWABS control unit from the 911 Carrera 4
(964).
Distinguishing feature on P. 039-236.
PSD diagnosisilroubleshooting
Printed in Gsmny -XXX", 1986
D39 - 235