Mi16 Multiple Issues!

[randomspeedfreak 4]

Hi everyone,

we are building converting out 205 project car, and after being sold an engine that came in pieces with a totally butchered loom and no top engine mount (grrr ), we are finally getting somewhere.

 

none of us are any good with electrics so sorry for any glaring errors!

 

we have the 2 row mi16 ecu (4.1 motronic i believe?)

 

We've managed to get the engine to turn over in the car,, but thats about it.

 

Firstly - the fuel pump does not prime or run when you turn the key, it will run however if we switch the relay on manually with 12v

 

secondly - we have no spark, and we don't think the injectors fire either

 

we have concluded that the ecu may not be getting power - which pin on the ecu is the power? does anyone know which colour, or number, wire does this correspond to?

 

there is an plug hanging about in the engine bay, it has a label on it from the previous muppet saying '(something something) UNIT' it is a black plug with 3 pins. it appears that the thick black wire that comes from it goes to the ecu? we have yet to find where this plugs in...could this be the problem?

 

thirdly - there is a wire in the foot well that is labeled K-light - a bit of research says this is a warning light, how should we attach this to the dash?

 

Forthly - (this is where we look silly) in the drivers foot well, along with the other bits of butchered loom is a wire that is labeled 'COIL +ve' and with all the bits he gave us with the engine is a coil, like what you would find on a carb'd car...except we also have a coil pack like we should have... wtf?!

 

 

does anyone have a wiring diagram for the engine in question?

 

Thanks in advance guys, sorry for the ammount of questions

[DrSarty 90 1 Cars]

Firstly, go into my profile and you should find in the files/downloads 2 & 3-row ECU diagrams which will explain the pin-outs. If you can't see it, I can send you a link.

 

Mi16 as standard doesn't have a coil pack. It has a dizzy (of sorts), an ignition amp on a metal backplate (heatsink) and an ignition coil. ECU triggers amp using crank position sensor signal, which triggers coil which sends HT voltage to dizzy cap.

 

K light you can forget about; it's not needed on a 2-row ECU,

 

I have a PDF of the Motronic 4.1 layout and components that you can have too.

 

Standard Mi16 2-row loom will also include 2 relays: 1 for fuel injectors and one for fuel pump. You'll need those or to make up a new loom using a double relay. The ECU triggers the relays, and probably why you have none of the things you should have.

[sport1901966 8]

The 3 pin plug could be the crank angle sensor, this would also explain non sparking/injecting and the fuel pump not running (ecu only powers the fuel pump when the engine is turning over). The crank sensor is mounted to the top of the gearbox

 

The coil+ could be the feed to the tacho from the coil (part mounted to the nearside of the intake manifold runners)

 

If you search for 'brown dash multiplugs' or something similar the k-light wire will connect to the dash wiring at one of these I believe.

 

Good luck!

[randomspeedfreak 4]

im struggling to see the link :/ do you think we could have a link to that? maybe email if its not too much trouble..

 

we are a little confused about the coil pack thing, as our one seems as though it should be there!

 

thanks for your help

[DrSarty 90 1 Cars]

I had an Mi16 2-row ECU once which did indeed go direct to the fuel pump. It was a thick yellow wire. However, that may have been coming back through the loom after going through one of the relays in the main bulk of the loom in the engine bay, where the ECU was under the driver's seat.

Edited September 17, 2010 by DrSarty

[randomspeedfreak 4]

The 3 pin plug could be the crank angle sensor, this would also explain non sparking/injecting and the fuel pump not running (ecu only powers the fuel pump when the engine is turning over). The crank sensor is mounted to the top of the gearbox

 

The coil+ could be the feed to the tacho from the coil (part mounted to the nearside of the intake manifold runners)

 

If you search for 'brown dash multiplugs' or something similar the k-light wire will connect to the dash wiring at one of these I believe.

 

Good luck!

 

okay we have a hole in the top of the g box -this could be the issue! i think we need a crank sensor! does anyone have a pic of one?

 

that is great thinking! thankyou very much will keep updated...

 

if anyone else has any input we are all ears!

 

cheers,

matt

[DrSarty 90 1 Cars]

Yes. Hole in gearbox casing top is for CAS. 3 wires (well 2 really - as one is just a shield) go to the ECU. The shield goes to the ECU ground, but it's not actually connected to anything at the sensor end.

 

Try this link for the 2-row PDF: http://forum.205gtidrivers.com/index.php?a...ost&id=8764

 

You definitely don't need a coil pack, as the engine doesn't run wasted spark. Coil bolts to inlet manifold; ignition amp on plate with heat paste to inner wing.

[Alan_M 66 1 Cars]

No K light on 2-row. 3-row yes.

 

I had an Mi16 2-row ECU once which did indeed go direct to the fuel pump. It was a thick yellow wire. However, that may have been coming back through the loom after going through one of the relays in the main bulk of the loom in the engine bay, where the ECU was under the driver's seat.

 

Mines a 2 row and has a K light.

[DrSarty 90 1 Cars]

Fair enough. There are several 'editions' of each ECU, but it's not vital anyway. If they all have them then I was wrong.

 

If you have the K light wire from your ECU and want to use it, then use the choke light wire which is a spade terminal low and right of the steering column, behind the small plastic cover.

 

I'm just trying to help these guys out. Getting it running woulkd be a good start, then they could always connect their K light later if they wanted to.

 

[sport1901966 8]

Just to add, if you need to buy a new crank sensor euro car parts sell them for the Mi16 and GTi6 get the Gti 6 one because it works fine (I'm using it) and is loads cheaper.

[James_m 0]

I think they are the same across the psa xu range, I'm using one from a 306 1.8 no doubt any scrap yard will have countless

[randomspeedfreak 4]

thanks very much lads we are buying one tonite - will keep u updated!

 

cheers

[C_W 3 1 Cars]

Yea the K-light is on all of them AFAIK but as said not at all necessary to get the engine running, it only activates the K-light bulb if wired up to the dash. (mine's a 2-row).