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944s2 3,0 engine wiring



My car is an 944 86 lux that i have spent loads of time getting it to the way it looks now.
The respay and s2 front i did last early last year.
What im doing now is fitting a 3.0 s2 motor complete with engine harness and module, torque tube, transmision,emf,dme, infact i have everything from the s2 to go in.
What im unsure of even after reading loads of posts is the wiring for the module.
944s3.com has it listed but i want try and confirm that it i correct in incase it fries the dme. They are talking about the 968 engine and loom, so i need to confirm if it is the same wiring as the 3.0s2
My post is not a question of what do i need or how much will it cost because i already have all the items needed,and im pulling the old engine and trans in about four weeks
Any advice please or even an ecu pinout fo the 3.0s2 dme.

Thanks in advance for any help

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Porsche 986 3.2s 2000

Last edited by Lance924; 01-02-2011 at 07:40 AM..
Old 01-02-2011, 05:47 AM
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If you have all the S2 engine and harness, it should be really as easy as installing the engine, harness, finding the right connectors to the sensors, fuel and ignition components and supplying constant and switched power. An electrical wiring diagram should tremendously help. If you need an electrical diagram, let me know.
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Old 01-02-2011, 08:27 AM
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Quote:
Originally Posted by bazar01 View Post
If you have all the S2 engine and harness, it should be really as easy as installing the engine, harness, finding the right connectors to the sensors, fuel and ignition components and supplying constant and switched power. An electrical wiring diagram should tremendously help. If you need an electrical diagram, let me know.
Hello and thanks for the reply,an electical diagram would be a great help.
Yes i do have the the complete harness. At the moment all the s2 parts have been removed and are ready to fit. The harness is still connected to all the correct places on the motor.
S3.COM lists the following connections for the harness to be fiited into my car, but they are talking about a 968 transplant.

.( DME pin 18 needs continous 12v power, while pin 27 needs "key on" 12v power).
Will those two connections power the igniion module.?

Thanks again
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Porsche 986 3.2s 2000

Last edited by Lance924; 01-02-2011 at 01:22 PM..
Old 01-02-2011, 08:44 AM
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Lance924, nice ride! If you have a complete S2 engine with DME, AFM and harness where is the problem? Everything matches. What is meant by module? Therein lies the problem. Terminology... Bazar01 is correct. There shouldn't be a problem with this install.
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Old 01-02-2011, 08:48 AM
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Quote:
Originally Posted by smokin_944 View Post
Lance924, nice ride! If you have a complete S2 engine with DME, AFM and harness where is the problem? Everything matches. What is meant by module? Therein lies the problem. Terminology... Bazar01 is correct. There shouldn't be a problem with this install.
Thankyou for the compliment.
By module i mean the ignition amp for the spark. As my own car does not have one i know i have to supply power for it.
The module will just plug straight into the new s2 harness but im unsure if the connections listed above are correct or indeed if i need to make them at all.

Thanks for your reply, any further advice welcome.
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Last edited by Lance924; 01-02-2011 at 09:05 AM..
Old 01-02-2011, 08:57 AM
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Thankyou both for your advice.
I still need t confirm if the connections .( DME pin 18 needs continous 12v power, while pin 27 needs "key on" 12v power).are the correct ones to use to supply constant and switched power for the ignition.
Also would i have to cut these wires to make a new connection or splice into them.

Thanks
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Old 01-02-2011, 01:27 PM
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I am a little lazy to look it up. Send me your email and I will send you a copy of the 1990 S2 electrical diagram.
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Old 01-02-2011, 01:35 PM
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pm sent thanks
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Old 01-02-2011, 01:49 PM
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I would like to thank bazar01 for sending me the s2 elec diagrams.
After much reading and studying the diagrams i am still unsure of the connections to be made.
As i have already said i do have the full engine wiring and the full engine bay harness with ignitor for the s2 motor that i can plug straight into my fuse box and DME.
From all my reading i will still need to supply a 12v source and switched live which is no problem as long as i knew where to conect them(and i dont).
I have read this over and over.
944/968 Engine Swap Wiring Changes

But that conflicts with the connections given s3.com
944S3.com.

I need help here as i dont want to fry the DME as soon as its plugged in.
Can anybody help to confirm the conections please.
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Old 01-03-2011, 12:00 PM
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The factory S2 in USA '89 - '91 had a ignition module mounted right behind drivers headlight on body of car! This wiring plug was part of the cars front wiring harness and went to center electronics box where relays are. So you must use a factory plug and mount it somewhere in engine compartment so that motor reads it, then send wires into central electrics box where you can wire it into the firewalls connection where the engine harness plugs into. You should only have a mess with a couple wires in that fiirewall connection! good luck
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Old 01-03-2011, 12:22 PM
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Quote:
Originally Posted by commdiver View Post
The factory S2 in USA '89 - '91 had a ignition module mounted right behind drivers headlight on body of car! This wiring plug was part of the cars front wiring harness and went to center electronics box where relays are. So you must use a factory plug and mount it somewhere in engine compartment so that motor reads it, then send wires into central electrics box where you can wire it into the firewalls connection where the engine harness plugs into. You should only have a mess with a couple wires in that fiirewall connection! good luck
.

Thanks or the reply, yes i have the factor harness with the ignition module plugged into it. I will be mounting it behind the passenger headlight as i believe thats were it would have been mounted.
Will the s2 factory harness supply the feeds that i need when plugged into an 86 na, this im not sure.
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Old 01-03-2011, 12:52 PM
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The differences reside in the 14 pin connector, the one the engine harness plugs into in front of the driver by the fuse panel. There are some differences there that need to be address so you get powere to the right components, through the engine harness/DME. I have a diagram of the 944NA, but do not have the 944S2 to compare. Perhaps someone else can lend a hand.

I removed the fuse panel and entire wiring harness form my race car and used the 14 pin chassis pigtail to feed power/ground to run the engine.

Pin # 968 (93) 944 (86) 944 S (87)
1 Ignition coil term 1 Ignition coil term 1 Ignitor term 5*
2 DME relay term 87 DME relay term 87 DME relay term 87
3 DME relay term 87 DME relay term 87 DME relay term 87
4 Fuel pump Fuel pump Fuel pump
5 DME relay term 85b DME relay term 85b DME relay term 85b
6 Oil press. Gauge Oil press. Gauge Oil press. Gauge
7 DME relay term 85 12V during starting (term 50 ign switch) Unused??
8 Water temp gauge Water temp gauge Water temp gauge
9 Oil press idiot light Oil press idiot light Oil press idiot light
10 Water temp idiot lit Water temp idiot lt Water temp idiot light
11 Not used Not used Not used
12 12 V fuse #7 Unused ? 12 V from fuse #7
13 Not Used AC Compressor AC compressor
14 Not Used Not used Ground for ignition coil wire (sheath of pin 1 wire)
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Old 01-03-2011, 01:23 PM
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Quote:
Originally Posted by North Coast Cab View Post
The differences reside in the 14 pin connector, the one the engine harness plugs into in front of the driver by the fuse panel. There are some differences there that need to be address so you get powere to the right components, through the engine harness/DME. I have a diagram of the 944NA, but do not have the 944S2 to compare. Perhaps someone else can lend a hand.

I removed the fuse panel and entire wiring harness form my race car and used the 14 pin chassis pigtail to feed power/ground to run the engine.

Pin # 968 (‘93) 944 (’86) 944 S (’87)
1 Ignition coil term 1 Ignition coil term 1 Ignitor term 5*
2 DME relay term 87 DME relay term 87 DME relay term 87
3 DME relay term 87 DME relay term 87 DME relay term 87
4 Fuel pump Fuel pump Fuel pump
5 DME relay term 85b DME relay term 85b DME relay term 85b
6 Oil press. Gauge Oil press. Gauge Oil press. Gauge
7 DME relay term 85 12V during starting (term 50 ign switch) Unused??
8 Water temp gauge Water temp gauge Water temp gauge
9 Oil press idiot light Oil press idiot light Oil press idiot light
10 Water temp idiot lit Water temp idiot lt Water temp idiot light
11 Not used Not used Not used
12 12 V fuse #7 Unused ? 12 V from fuse #7
13 Not Used AC Compressor AC compressor
14 Not Used Not used Ground for ignition coil wire (sheath of pin 1 wire)
Thanks for the reply.
Can i assume that the wiring for the s2 motor is the same as the 3.0 968?
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Porsche 986 3.2s 2000

Last edited by Lance924; 01-03-2011 at 01:33 PM..
Old 01-03-2011, 01:31 PM
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Quote:
Originally Posted by Lance924 View Post
Thanks for the reply.
Can i assume that the wiring for the s2 motor is the same as the 3.0 968?
Nope, can't assume the 968 and S2 14-pin DME connector and 14-pin connector by fuse panel are the same.

You really have to do your homework on the pin assignments especially you have a 1986 8V motor which does not have the ignitor cisrcuit.

You have the complete DME and engine harness so that side should be easy. Just make sure you supply power to the right pins. Now the ignitor circuit, you can just wire it so it is part of the spark ignition circuit becaue your original 86 944 don't have this circuit.
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Last edited by bazar01; 01-03-2011 at 02:06 PM..
Old 01-03-2011, 02:02 PM
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Quote:
Originally Posted by bazar01 View Post
Nope, can't assume the 968 and S2 14-pin DME connector and 14-pin connector by fuse panel are the same.

You really have to do your homework on the pin assignments especially you have a 1986 8V motor which does not have the ignitor cisrcuit.

You have the complete DME and engine harness so that side should be easy. Just make sure you supply power to the right pins. Now the ignitor circuit, you can just wire it so it is part of the spark ignition circuit becaue your original 86 944 don't have this circuit.
Thanks again for the diagrams.
I have studied them over and over.
The ignitor has six pins but only uses five wires.
pin 5 to dme pin 1 and also pin 1 on the 14 pin connector
pin 4 to switch ignition
pin 2 to ground
pin 1 to coil.
Unsure how to match these with my own car.
As for the home work, i have done none stop reading for about 8 days before i posted on here.
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Last edited by Lance924; 01-03-2011 at 02:38 PM..
Old 01-03-2011, 02:24 PM
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Quote:
Originally Posted by Lance924 View Post
Thanks again for the diagrams.
I have studied them over and over.
The ignitor has six pins but only uses five wires.
pin 5 to dme pin 1 and also pin 1 on the 14 pin connector
pin 4 to switch ignition
pin 2 to ground
pin 1 to coil.
Unsure how to match these with my own car.
As for the home work, i have done none stop reading for about 8 days before i posted on here.
Pin 1 of ignitor goes to ignition coil negative terminal.
on your 86 944, remove wire from pin 1 on 14 pin connector and connect this wire to your ignitor pin 1. This pin 1 on the 14 connector will now be vacant. You will use this spot for the pin 5 of the ignitor
pin 2 of ignitor just connect to nearest ground
pin 4 of ignitor - just find any switched 12V from the fuse panel or run a fused 12V for test
pin 5 of ignitor - use the spot on the 14 pin connector that is now vacant to connect to DME pin 1.

This is just from looking at the diagram.
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Last edited by bazar01; 01-03-2011 at 05:21 PM..
Old 01-03-2011, 05:19 PM
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Thankyou very, very much.
I could see from the diagrams were these connections were going but I couldn't decide if I would need to remove them or splice into them. You have explained it so it's very to understand and I am very grateful. The only difference I can see now is terminal 87 from the Dme relay as it goes to two different points on the Dme for the 86 and the s2.
Once again thankyou for helping me get my head around the ignitor.
Old 01-03-2011, 06:17 PM
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Quote:
Originally Posted by Lance924 View Post
Thankyou very, very much.
I could see from the diagrams were these connections were going but I couldn't decide if I would need to remove them or splice into them. You have explained it so it's very to understand and I am very grateful. The only difference I can see now is terminal 87 from the Dme relay as it goes to two different points on the Dme for the 86 and the s2.
Once again thankyou for helping me get my head around the ignitor.
From the 944/968 Engine Swap Wiring Changes, DME relay terminal 87 on your 86 goes to pin 3 of the DME computer and it's the same for the S2 DME at pin 3. They go to the same pin on the DME computer.
So if you have the S2 DME brake booster 14 pin harness and connector, it should be the same. This is the 12V switched power to DME computer. Make sure you check the other pinouts for both 14 pin connectors.
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Old 01-03-2011, 06:23 PM
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Hi Again,
Sorry but i still really need some help here.
I have now installed the s2 motor into my car which was an 86 8valve.
I have also installed a complete s2 engine harness and front loom from an S so i have all the right connections for the ignitor.
All pins and colours match on both the 14 pin connector infront of the brake booster.
Problem is i still cannot get a spark or power the pump.
I have tried differant ways of wiring the ignitor form the info in the last posts above but still no joy.

Please i really need help with this one.
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Old 02-24-2011, 06:25 AM
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Ya, you need the ICM and unfortunately Porsche ran the wiring for that through the body harness not the engine harnes on the S2. I have and S2 and since I'm selling the motor I've been looking into that problem because people want to do what you're doing. Because the S2, S and maybe the 968 use a different sensor than the 8v (wheel and sensor in cam tower) it need the ICM (ignition control module). Not sure why your not getting fire though.

Old 03-02-2011, 02:18 PM
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