DMEDiagnosis Troubleshooting

Dr. Ing. h.c. F. Porsche Aktiengesellschaft

Test Point Description Page

Precautions 2

Important Vehicle Information 3

Test Requirements 4

Pin assignments of DME Control Unit Plug 7

Effects of Faults (Cross Reference List) 8

1 Power Supply 9

2 Engine Temperature Sensor 2 10

3 Throttle Potentiometer 11

4 Oil Temperature Sensor 11

5 Rpm signal 11

6 Speed signal <-Speedometer 12

7 Air flow sensor 13

8 Oxygen regulation 14

9 Oxygen sensor 15

10 Ignition timing change 15

11 Opening winding of idle stabilizer 16

12 Closing winding of idle Activation 16

13 Triggering of AC relay 17

14 Knock sensor 1 17

15 Knock sensor 2 18

16 Control unit faulty 18

17 Hall signal 18

18 VarioCam 19

19 Idle CO potentiometer 19

20 Control unit faulty 19

21 Fuel pump relay (DME relay) 20

22 Tank ventilation valve 20

23 Check Engine warning lamp 21

24 - 27 Injector valves 22

28 Fuel pressure 24

29 Intake system leaks 26

30 Ground and plug connections 26

31 Ignition system 28

32 Alternator, regulator 29

33 Leads K and L 28

CO and idle speed test 30

Coding the control unit 30

Check Engine lamp 31

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