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Saveit

Mi16 Wiring Once Again...

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Saveit

First of all, sorry for asking about the MI16 conversion wiring once again since i know there are many topics about this. And believe me, i have already searched!!

 

But i cant seem to find an answer to my question since my starting point is a bit different.

 

I have just bought a 2.4L 200bhp mi16 engine. I got everything with it from the car that it used to be in (405 MI16). It has the Motronic ECU which i presume is somehow chipped or something which is why we would like to run it on this ECU.

 

My question is: What is the necessary wires i have to join with the 205 wiring to make it run (of course without loosing power). I read a post from 2007 by Graham (pugtourqe) stating that you actually only needed to find 2 wires from the 205 wiring to make it run (that was a ZX Motronic system, but i guess it is somewhat the same?). The 205 is currently a 1.6 with jetronic. And do you have some pictures/diagrams on which wires to connect with which?

 

It is important to state that this car is used for low budget offroad racing. This means that lights and so on have been removed. Therefore we only need the absolutely necessary wires to make it run without loosing the power.

 

Every help is greatly appreciated!

 

Thank you

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M@tt

to get the engine running you just need 3 wires

a switched live to power the ecu, the wire to the fuel pump and the starter wire and away you go

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trialster

i would have thought you will only need the following to make it run.

 

earth

switched live

fuel pump

 

i think it was just these which allowed my mi16 run in the early stages of the conversion.

 

then if you do need the rev counter, water temp, oil pressure gauges etc.. then its just a case of looking up the 205 wiring numbers and connecting them to the appropriate component/sensor on the engine.

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Saveit

BRILLIANT!

 

So could i actually run 2 wiring setups on the car? The one from the Mi16 with the ECU running the engine and so on, and the one which is in the car right now running all the gauges and so on? Or shall the 2 wiringlooms have to be connected?

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Miles

You will find this on a search but you will need at least

 

1. Switched Live

2. Main Live

3. Fuel Pump Feed

4. Earth

5. Rev Counter (Not a must but a good idea)

 

All the other sensor's can come from the 205 loom or make your own up

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Saveit

But could i run 2 seperate wiring looms? The thing is that i am not that good with car electronics and so on yet, and since it is just used for racing, i dont care if i had 3 or 4 seperate wiring looms in the car. Could i use the existing wiring loom that is currently in the car to run the gauges and so on, and then just connect the new mi16 wiring to the necessary wires and then let that wiring loom run the engine and so on?

 

EDIT: It just crossed my mind, that if i were to have both the mi16 wiring and the original 205 wiring, then i could just run the fuelpump and so on on the existing 205 wiring couldnt i? This means that i only have to connect a switched live to the mi16 ECU, and then i would be running with the mi16 ECU for the engine, and the other 205 wiring for everything else wouldnt it?

Edited by Saveit

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M@tt

don't quite know what you mean by several different looms, you really need to have a search and read up on the conversion to understand what's involved.

 

Its not that complicated you basically end up up with the 405 mi16 loom with a connector(s) with and the 205 loom with a couple of connectors and its just a case of mating up the corresponding wires between the two but as mentioned the bare minimum you'd need to join up between the 2 looms are those listed above.

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Saveit

And do we have some diagrams over which wires is the switched live and earth on the ECU?

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trialster

Wiring topic - 205 car - mi16 engine

 

that link should help with getting your head around it. it helped me tremendously!

 

if i were you i'd leave all the wiring on the mi16 engine, chop the loom to the right length, then label the ends of each of the wires with the gauge they connect to. then it's just a simple case of getting a 205 haynes manual and matching up the wire numbers :blush:

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Saveit

Since i just got the 405 loom with the engine, and i therefore didnt have the chance to look at which wires goes where. So problem is that i still cannot find out which wires on the ECU are main live, switched live and earth? Do anyone have a diagram of the ECU (it is the 3 row ECU) and what alle the wires are for? Or someone can perhaps explain which wires are the mentioned ones?

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trialster

to start with the three wires which you mention should be slightly thicker than all the instrument wires. the earth should be green and yellow. however im not sure which colour the main and switched lives are. your best bet is to check which wire goes where with simple continuity tests with a multimeter :rolleyes:

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Saveit

Okay ill do that.

 

But i am still wondering if there really isnt any diagram of the ECU?!

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jplautomotive

i have pug 405 diagrames , is it xu9 or xu10 ?

 

jonny

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nick

Are you after the pin outs for the ECU? If so, just do a search for CAPS.

 

Nick

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Saveit

CAPS is for the 2 row ECU as far as i can tell. I need pin outs for the 3 row Motronic management.

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pug_ham

You don't need a switched live to the ecu imo, the switched earths for the fuel pump & injection relay are via the ecu & the ecu is powered permanently directly from the shunt box.

 

Your loom should have a suitable thick wire (possibly brown) with a black connector with two of these wire in it that is unlike any others on the loom which will plug nto the shunt box on the slam panel.

 

The UK Haynes manual diagrams for the Motronic 1.3 ecu can be downloaded from here (right click save target as).

 

Graham.

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Saveit
You don't need a switched live to the ecu imo, the switched earths for the fuel pump & injection relay are via the ecu & the ecu is powered permanently directly from the shunt box.

 

Your loom should have a suitable thick wire (possibly brown) with a black connector with two of these wire in it that is unlike any others on the loom which will plug nto the shunt box on the slam panel.

 

The UK Haynes manual diagrams for the Motronic 1.3 ecu can be downloaded from here (right click save target as).

 

Graham.

 

Now, Graham this sounds like something i can really use. But, since i am from Denmark the words "shunt box" and "slam panel" is not in my personal vocabulary :rolleyes: What is the shunt box and the slam panel? Possibly an image?

Edited by Saveit

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pug_ham

There are pictures around but its easy enough to explain really.

 

The slam panel is the panel that runs across the front of the engine bay where the bonnet catches when you slam it shut.(white panel between the headlights below)

 

Both of them can be seen in the picture below;

 

19enginebj0.th.jpg

 

Judging by your other topic this car might not have a shunt box fitted but the battery positive lead will have a connector that the ecu plugs into as explained in this topic but if you have a shunt box it is the small black box bolted to the slam panel near the l/h headlight (between the PAS reservoir bracket on the picture above).

 

Graham.

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Saveit

Ahhh okay. But i am a bit confused now. Just to sum up, which wires do i need to find and connect to wher to make it run?

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pug_ham

Wires as above by Miles or below;

  • rev counter (wire #112).
  • fuel pump (wire #76).
  • coil switched live (wire #2A).
  • Main battery connection to the ecu.

Earth the loom as originally on the Jetronic loom to the gearbox earth stud using tjhe ring terminal that should be present on the M1.3 loom.

 

Graham.

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