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 Need Help with ECU/Cable harness from FL for Motorswap 
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Post Need Help with ECU/Cable harness from FL for Motorswap
Hello, Im from Vienna (Austria) my English is not so perfect.
Ich have a Mx3 FL K8 V6 95model. I buy the Engine from Mx6 komplett.
I have the cable harness from preFL K8.
And i have the ECU from MX6.
I read in a Forum i must change (soldering (braze) pins or cable from cable harness to work corectly with Engine.

PLease, can someone help me what cable i must be change from cable harness?

HAve anybody a Instruction or a link for a Instruction how cable must be change?

Befor i swap the Engine i wont know this.


September 20 2009, 6:51 AM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
What exectly do you mean by FL? I can only guess that FL means OBDII, in which case, what year is the mx6 motor?

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September 20 2009, 10:41 AM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
I want change my Engine ( K8 1.9 V6 ). My MX is 95model FL and i have a other cable harness from ECU to Engine.

I want change the Engine from MX6 2.5V6 ( KLDE 167hp ).

What I have:

Complete Engine with all parts (MX6 ´92)
ECU KL05 (MX6 `92)
CAble Harness K8 (MX3 V6 preFL ´92)

Befor I start the change, i read i many threads i must change the pins from cable harness ( K8 MX3 ´92 ) to work corectly with Engine or ECU.


September 20 2009, 11:14 AM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
Aren't the '92 mx6's the 1st generation, at least in north america? But anyway, if you have the '92 harness and ECU you'll be able to just swap harnesses and everything will work.

Since you have the harness out, I would suggest looking over it very carefully, especially at the plugs. The wires tend to break or fray and it will cause really annoying electrical problems. If you see bare wire anywhere, solder in a new connector or wire.

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September 20 2009, 2:43 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
hmm but the Harness from 92 go not only to the ECU also go somewhere else in the Car..and the FL Mx3 (FaceLift Mod 94-98) is not the Same like PreFL (92-94).
On the ECU some Pins is also not the same.
Did nobody swap a 2,5 KLDE Engine in a Mx-3 V6 FL (Facelift) 95´Model??

hmm.... :(


September 21 2009, 3:06 AM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
Oh so it means facelift. Both ECU harnesses are interchangeable with the right ECU because they both go to the same spots. What you have will plug right up, I don't know what you're worrying about.

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September 21 2009, 10:42 AM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
He's likely talking about the ECU not connecting to the front harness, not the engine harness.

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September 21 2009, 3:05 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
Only the engine harness plugs into the ECU, the harness itself has a few plugs that connect it to the gauges and stuff, but that's completely separate from the ECU plugs.

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September 21 2009, 7:03 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
But he's talking about changing engine harness AND ECU, and wondering whether the connectors on the engine harness will connect to the main harness. The main harness is what has the cluster connectors, and I don't know that that harness from the MX-3 will connect to the MX-6 engine harness without relocating pins.

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September 21 2009, 7:38 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
umcamara wrote:
But he's talking about changing engine harness AND ECU, and wondering whether the connectors on the engine harness will connect to the main harness. The main harness is what has the cluster connectors, and I don't know that that harness from the MX-3 will connect to the MX-6 engine harness without relocating pins.


He said that he has an OBD1 mx3 engine harness so that won't be a problem.

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September 21 2009, 9:34 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
Here, i mean this Hearnes:

http://foto.arcor-online.net/palb/alben/82/920582/1440_6135333830653965.jpg

Have anyone a wiring diagram from this harness/pins, what pins have what funktion?
Or what pins goes what way?

My facelift have many other colors or many more to prefacelift :(


September 22 2009, 10:56 AM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
So the other connectors that don't go into the ECU don't connect to your current dash harness?

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September 22 2009, 9:40 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
The instrument panel (dash) harness, and the front harness are two different harnesses. The front harness contains the cluster connectors, and connects to the engine harness.

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September 22 2009, 9:41 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
I thought that the dash harness connects to the ECU, isn't it all one big harness that runs alog the inside of the dashboard?. From what I remember the front harness is the one that works the headlights and fans and stuff.

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1999 Audi A4 2.8Q -- New ride


September 22 2009, 9:46 PM
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Post Re: Need Help with ECU/Cable harness from FL for Motorswap
The front harness does go to the headlights and fuse box under the hood, then into the cabin through the driver side firewall, then runs under the dash and connects to the cluster/ignition switch/etc, then back into the engine bay through the passenger side firewall and to the headlights on that side of the car.

The instrument panel harness goes to the blower motor system and controls, radio, headlight/wiper/cruise switches, etc. It is a lot smaller than the front harness, and MUCH easier to remove.

It's all shown in the wiring diagram section of the online manual. This link shows just the front and engine harnesses, and shows where the front harness connects to the cluster:

Click Here

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September 22 2009, 11:58 PM
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