944 S3 aka 944 to 968 drivetrain engine conversion
04-16-2016, 08:41 AM
#16
Racer
Join Date: Oct 2003
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I love my 78 m22 hybrid. Haven't had it to 150 but at 3200 rpm 110 mph it's a real trip.
Last edited by MN; 04-16-2016 at 09:16 AM.
04-18-2016, 04:58 PM
#17
Burning Brakes
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Fronkenstein aka Pete
05-07-2018, 03:53 PM
#20
4th Gear
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So if anyone wants a full pinout of the DME connector and all the gory details including the wire colors here you go:
944 S3 wiring change chart (PDF)
944 S3 wiring change chart (Excel)
I found a very important missing bit of info. It seems DME pin 27 requires Term 15 power aka switched +12V. This is provided via the 14 pin DME connector that is under the dash on the passenger side. It is used primarily to provide the diagnostic port access to the DME. However pin 7 of that connector goes to DME pin 27. The wire at pin 7 is black.
Without power to pin 27 the DME is only half awake and it will appear as though you have a bad DME relay. Then after jumping the relay, testing crank position sensor output all is good. So you check for switched ground at DME pin 36 (pin 85 DME relay) and it fails and the finger points at a bad DME.
I wasted a lot of time chasing that. I should have read all the pin definitions on the DME. Anyway it all works
Hopefully it will help you out and you won't go through what I went through. Story at 11 can be found here
Fronkenstein
944 S3 wiring change chart (PDF)
944 S3 wiring change chart (Excel)
I found a very important missing bit of info. It seems DME pin 27 requires Term 15 power aka switched +12V. This is provided via the 14 pin DME connector that is under the dash on the passenger side. It is used primarily to provide the diagnostic port access to the DME. However pin 7 of that connector goes to DME pin 27. The wire at pin 7 is black.
Without power to pin 27 the DME is only half awake and it will appear as though you have a bad DME relay. Then after jumping the relay, testing crank position sensor output all is good. So you check for switched ground at DME pin 36 (pin 85 DME relay) and it fails and the finger points at a bad DME.
I wasted a lot of time chasing that. I should have read all the pin definitions on the DME. Anyway it all works
Hopefully it will help you out and you won't go through what I went through. Story at 11 can be found here
Fronkenstein
Many thanks again, for saving any more head-scratching!
Tref.
05-07-2018, 04:34 PM
#21
Burning Brakes
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Let me know if you figure out a good speedo solution
I have all the 968 ABS fired speedo pickup but haven't got around to figuring it out. If you do please share here. Glad the thread was helpful!
Fronkenstein
Fronkenstein
