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Can someone please let me know the pin code on the pre 2001 ECU?

I can't find it in any of my manuals and need it for a data logger - this is for a cup car but until 2001 the ecus were the same

THX

JM

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Is this what you need?

post-2-1144457770_thumb.jpg

Close but no cigar yet. It's the diagram that shows every pin that goes in the DME e.g. pin 80 = rpm signal pin 81 = ... etc

My manuals (pdf versions...) has everything except that! I have the 964 and 993 manuals and they have a very simple page with a view of the connector and next to each pin the function...

TIA

JM

Is this what you need?

post-2-1144457770_thumb.jpg

This, but for the 2001 GT3, is what I'm looking for (and it may be that it's very similar for the Gt3 to what is here below...)

This for a 1999 C2. You didn't mention what year car you have.

1 - Heating of HO2S after TWC

2 - Idle air control valve, closing coil

3 - Fuel injector, cylinder 1

4 - Fuel injector, cylinder 2

5 - Fuel injector, cylinder 3

6 - Ground point 9

7 - EVAP canister shutoff valve

8 - Check Engine MIL

9 - not assigned

10 - not assigned

11 - not assigned

12 - Crash signal (airbag)

13 - knock sensor 1 (cyl. 1-3)

14 - Medium pressure switch (A/C)

15 - Intake air temperature sensor

16 - Engine compartment temperature sensor

17 - Signal, mass air flow sensor

18 - Signal, H02S 2 ahead of TWC

19 - Signal, HO2S 1 ahead of TWC

20 - Ground, speed sender

21 - Signal, camshaft position sensor 1 + 2

22 - Ignition coil, cyl. 4 terminal 1

23 - Ignition coil, cyl. 3 terminal 1

24 - Ignition coil, cyl. 5 terminal 1

25 - Camshaft adjustment, bank 2

26 - Terminal 30

27 - Triggering of DME relay, terminal 85

28 - Ground, electronic system (shield)

29 - Idle air control valve opening coil

30 - Heating of HO2S ahead of TWC

31 - Fuel injector, cylinder 6

32 - Fuel injector, cylinder 4

33 - Fuel injector, cylinder 5

34 - Ground, sender

35 - Coolant fan, stage 1

36 - Coolant fan, stage 2

37 - Triggering of relay (terminal 85), secondary air pump

38 - Version coding (ground for Tiptronic)

39 - Fuel reserve pilot light

40 - not assigned

41 - Knock sensor 2 (cyl. 4-6)

42 - Automatic I/M test

43 - not assigned

44 - Signal, throttle position sensor

45 - Ground, mass air flow sensor

46 - Ground, oxygen sensors

47 - 5-volt supply for mass air flow sensor

48 - Nominal engine torque to TC control module

49 - Ignition coil, cyl. 1 terminal 1

50 - Ignition coil, cyl. 6 terminal 1

51 - Ignition coil, cyl. 2 terminal 1

52 - Camshaft adjustment, bank 1

53 - 5-volt supply, throttle position sensor

54 - Voltage supply for various components

55 - Ground, ignition

56 - Terminal 15

57 - not assigned

58 - Actual engine torque from TC control module

59 - Tuning flap (intake manifold switchover)

60 - Programming voltage

61 - EVAP canister purge valve

62 - A/C compressor On

63 - Triggering of fuel pump relay (terminal 85)

64 - not assigned

65 - Relay of engine compartment purge fan (terminal 85)

66 - Start-inhibit relay (terminal 85)

67 - not assigned

68 - Position switch/clutch switch

69 - A/C compressor requirement

70 - not assigned

71 - Ground, knock sensors

72 - Tank pressure sensor

73 - Oil temperature sensor

74 - Engine coolant temperature sensor

75 - not assigned

76 - Signal, H025 2 after TWC

77 - Signal, H025 1 after TWC

78 - Signal, rpm crankshaft position sensor

79 - Speed signal from ABS control module

80 - Speed signal output

81 - not assigned

82 - Coolant level

83 - Fuel gauge

84 - not assigned

85 - CAN low

86 - CAN high

87 - L wire

88 - K wire

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I sent you a PM with some info...

Loren,

Something funny happened with my race car and I don't know what it is... The RPM should have been a white wire and the throttle position a yellow and black.

I could never find the yellow and black but I did find the white and guess what... NOTHING was logging.

I finally got the RPM signal from the violet/green wire in the OBD II plug, conveniently located in the middle of the rear section.

Thanks for everything!

JM

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OBD II plug under the dash board?

I sent you a PM with some info...

Loren,

Something funny happened with my race car and I don't know what it is... The RPM should have been a white wire and the throttle position a yellow and black.

I could never find the yellow and black but I did find the white and guess what... NOTHING was logging.

I finally got the RPM signal from the violet/green wire in the OBD II plug, conveniently located in the middle of the rear section.

Thanks for everything!

JM

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OBD II plug under the dash board?

I sent you a PM with some info...

Loren,

Something funny happened with my race car and I don't know what it is... The RPM should have been a white wire and the throttle position a yellow and black.

I could never find the yellow and black but I did find the white and guess what... NOTHING was logging.

I finally got the RPM signal from the violet/green wire in the OBD II plug, conveniently located in the middle of the rear section.

Thanks for everything!

JM

No, it's a cup car so the OBD II plug is in the middle, behind the only seat.

JM

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  • 2 weeks later...

I sent you a PM with some info...

Loren,

Something funny happened with my race car and I don't know what it is... The RPM should have been a white wire and the throttle position a yellow and black.

I could never find the yellow and black but I did find the white and guess what... NOTHING was logging.

I finally got the RPM signal from the violet/green wire in the OBD II plug, conveniently located in the middle of the rear section.

Thanks for everything!

JM

That's because the white wire is a input to the ECU which the ECU translates to an RPM signal and outputs via the wire marked "TN-SIGNAL" (Violet/Green I believe).
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  • 1 month later...

I finally got the RPM signal from the violet/green wire in the OBD II plug, conveniently located in the middle of the rear section.

That's because the white wire is a input to the ECU which the ECU translates to an RPM signal and outputs via the wire marked "TN-SIGNAL" (Violet/Green I believe).

Should this also work on street GT3s, and more broadly 996s?

Do any of you know which OBD II plug pin the violet/green wire goes to? (I'm also debating tapping in through the connector versus splicing into the wire)

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Should this also work on street GT3s, and more broadly 996s?

Do any of you know which OBD II plug pin the violet/green wire goes to? (I'm also debating tapping in through the connector versus splicing into the wire)

Specifically this thread was about an RoW (not US) pre 2001 GT3. And, Carerra's have had 3 different DME's so each should be reviewed independently.
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Should this also work on street GT3s, and more broadly 996s?

Do any of you know which OBD II plug pin the violet/green wire goes to? (I'm also debating tapping in through the connector versus splicing into the wire)

Specifically this thread was about an RoW (not US) pre 2001 GT3. And, Carerra's have had 3 different DME's so each should be reviewed independently.

Ah, thanks Loren, the variety must explain the lack of specifc information on various boards. So does that mean that the RPM signal is on different pins on the ODBII connector (not DME) for different 996 models? I would have thought that they might have kept that consistent. Is the best thing to just look for the violet/green wire (or could it be different colors?)?

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o does that mean that the RPM signal is on different pins on the ODBII connector (not DME) for different 996 models?
I did not say that. What I am saying is that the DME's from MY99 are very different from the DME's used MY01. As well in MY05 they changed again. Some of the OBD II wiring is different.

The best solution is to say what year and model car you are interested in so someone can check the schematic.

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Some of the OBD II wiring is different.

The best solution is to say what year and model car you are interested in so someone can check the schematic.

Gotcha! For me, it's a USA 2004 GT3... thanks in advance!

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  • 2 weeks later...
  • 1 year later...
  • Admin
For a MY04 GT3 (US) it will be A9 on the OBD II connector - should be a violet/green wire. So in this case it is the same.

Does anyone know what's the pin #/wire for the tach signal at the DME for a MY04 GT3?

Just as I quoted above - it is easiest to take it off the OBD II connector.

If you must take off the DME it is pin D17 (same violet/green wire.

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For a MY04 GT3 (US) it will be A9 on the OBD II connector - should be a violet/green wire. So in this case it is the same.

Does anyone know what's the pin #/wire for the tach signal at the DME for a MY04 GT3?

Just as I quoted above - it is easiest to take it off the OBD II connector.

If you must take off the DME it is pin D17 (same violet/green wire.

Thanks Loren.

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