Porsche 944 - Manual (Page 31)

944 Maintenance, Self-diagnosis
03
Troubleshooting
Diagnosis using the tester can refer only to
the error path, but not to a defective
component.
Note:
Before troubleshooting, the entire error
memory must be read out.
Error code 1111
The supply voltage is too low
< 10 V or too high > 16 V.
Possible causes for too low a supply
voltage:
Battery exhausted
Poor contact on the grounding strap
Poor contact on the control unit
A defective regulator may be the cause
of
too high a supply voltage.
Troubleshooting
Printed in Germany - XVI, 1987
03 - 19