Porsche 928 Workshop Manual page 490

27
Starter, Power Supply, Tempostat
928
TESTING MULTI-PIN PLUG OF TEMPOSTAT
CONTROL UNIT
Note:
Use a voltmeter or ohmmeter to
carry out tests on disconnected
plug receptacle.
l.Turn ignition key to position X.
2.Connect voltmeter to ter.1 (plus)
and ter.12 (minus).
Reading: battery voltage
3.Connect voltmeter to ter.3 and
ter.12
Reading: battery voltage
Push operating switch toward
"Off".
Reading: 0 volts
4.Connect voltmeter to ter.4 and
ter.12
Reading: 0 volts
Press operating switch toward
"set/accelerate".
Reading: battery voltage
S.Connect voltmeter to ter.6 and
ter.12
Reading: 0 volts
Press operating switch toward
"resume".
Reading: battery voltage
6.Connect voltmeter to ter.8 and
ter. 12
Reading: 0 volts
Press brake pedal.
Reading: battery voltage
7.Connect voltmeter to ter.1 and
ter.14
Reading: battery voltage
Press clutch.
Reading: 0 volts
8.Connect ohmmeter
to ter.11
and
ter.12
Push car slowly.
The reading on the gage must
alternate between 0 ohm and
- ohm.
9.Connect ohmmeter to ter.5 and
ter.8
Reading: approx. 30 - 40 ohm
lO.Connect ohmmeter to ter.7 and
ter.10
Reading: approx 2 - 6 ohm
ll.Connect ohmmeter to ter.9 and
ter.12
Reading: 2 - 4 kohm
lZ.Connect ohmmeter to ter.12 and
ter.13
Reading: 2 - 4 kohm
27 - 22
Testing Multi-Pin Plug of
Tempostat Control Unit
Printed in Germany