Testing Multipin Plug Of Tempostat Control Unit

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Note:

Use a voltmeter or ohmmeter to carry out tests on disconnected plug receptacle.

Porsche 993 Tempostat Position

1.Turn ignition key to position X.

2.Connect voltmeter to ter.l (plus) and ter.12 (minus).

Reading: battery voltage

5.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.l 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.

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

9.Connect ohmmeter to ter.5 and ter.8

Reading: approx. 30 - 40 ohm

10.Connect ohmmeter to ter.7 and ter.10

Reading: approx 2-6 ohm

11.Connect ohmmeter to ter.9 and ter.12

Reading: 2-4 kohm

12.Connect ohmmeter to ter.12 and ter.13

Reading: 2-4 kohm

27 - 22 Testing Multi-Pin Plug of Tempostat Control Unit

Note:

If the readings stated in steps 9 through 12 are not reached, test the actuator half of the plug in the same way.

13.Connect ohmmeter to ter.l and ter.7

Reading: 2-6 ohm

14.Connect ohmmeter to ter.5 and ter.6

Reading: 30 - 40 ohm

15.Connect ohmmeter to ter.2 and ter.4

Reading: 2-4 kohm

16.Connect ohmmeter to ter.2 and ter.3

Reading: 2-4 kohm

If these tests do not reveal a fault, replace the control unit.

Testing Multi-Pin Plug of Tempostat Control Unit

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