Best Way To Wire Up An Mi?

[Edd-XS 0]

Ive got a couple of weeks or so before i pick up my MI, and intend to have the wiring loom already done and in place.

I have both 205 looms and 405 looms seperate and out of the car. I was under the impression the best thing to do was to use the 405 loom and fit the 205 multi-plugs in-place of the 405 ones. Ive also heard its best to remake the whole loom, and as I have time to, I want to do it the best and neatest way possible.

Obviously Im going to need the 205 dash plugs, and the 405 ECU so should I just strip both looms back and use the 405 management and the 205 sensors? What do the relays do on the 405 loom (white wires 1a, 18a and yellow wire 1 come from the 405 multi-plug end)?

I understand the tachy relay from the 205 set-up is obsolete with the 405 management?

Thanks guys and sorry for any easy questions!

Edd

[inferno 1]

i think youll find this info has been posted many times before! try a search on wiring / mi16 conversion ect...

[taylorspug 7]

Edd, THIS SITE may help you.

 

Keywords for searches: MI-16 405 wiring loom wiring up management.

Edited June 20, 2006 by taylorspug

[Edd-XS 0]

cheers, Ive done a search but couldnt find much relating to my exact issue, it all seemed to be using bx looms and my 405 loom seems slightly different to most ive read about.

Dan thanks for the link, Ive scoured that site quite alot already. The mi diagram is helpful with regards where the sensors will go but im still abit confused about these 2 white and 1 yellow, wires im left with on another plug!

Thanks anyway and apologies for posting in the wrong section, i assumed this was only for aftermarket management set-ups!

Edd

[d-9 0]

Wire colours mean NOTHING. There are some traditions, like in all the 205gtis ive seen the switched live is a thick red wire, but there is nothing in the spec so dont assume this. Looking at the wiring diagrams and comparing the wire numbers is the only way to identify wires for sure (and then use the correct wiring diagram, 405 may have different no's to a 205, which may have different no's to a 309).

 

When I do 405 looms I dont make a link loom, instead I chop out the 405 plugs and solder the 205 loom straight into it, generally a tidyer solution and more moisture/dirt proof.

[Edd-XS 0]

When I do 405 looms I dont make a link loom, instead I chop out the 405 plugs and solder the 205 loom straight into it, generally a tidyer solution and more moisture/dirt proof.

Thankyou d-9, this is exactly what i intend to do, bit of a pain the ecu and dash clocks are on alternating ends of the loom though, might try and make up a waterproof container for the ECU and leave it in the engine bay along with the relays.

It seems there are lots of ways of doing this and I want to do it right! No link loom for me though.

Edd

[d-9 0]

You'll find that the wire for the ECU is long enough that you can put the ecu in the original position under the dash, just undo all the tape and rebundle it up with the bit of the 205 loom you spliced in. I didnt manage to get the mi16 relays into the cabin thou which is a shame.

 

The hard part abotu makign a loom is getting the lengths right!

[C_W 3 1 Cars]

The 405 loom is perfect length so that the ECU sits under the dash in the original place with the engine wired up. I chopped off the connectors off the 405 loom and stripped my 405 loom back for each individual wire and then mated them with the 205 wires (tape the 205 connecters near the ECU plug to keep these steady and get the lengths right to mate up to the 405 wires.

[d-9 0]

Did you have to add an altenator wire? I was quite surprised there wasnt one in the 405 loom i had.

[C_W 3 1 Cars]

There is an alternator wire in the 405 loom but there isn't an oil pressure gauge sender wire in the 405 loom; you may have mistaken the alternator wire for being an oil pressure wiere (only has oil pressure light in a 405). So you need to add an extra wire in this vicinity to wire up the larger oil gauge sender. Doesn't matter really what wire goes where here as long as its wired correctly at the other end.

[Edd-XS 0]

The 405 loom is perfect length so that the ECU sits under the dash in the original place with the engine wired up. I chopped off the connectors off the 405 loom and stripped my 405 loom back for each individual wire and then mated them with the 205 wires (tape the 205 connecters near the ECU plug to keep these steady and get the lengths right to mate up to the 405 wires.

Perfect! Ive found the alternator wire but im sure I had an oil pressure meter aswell?

Assuming the white and yellow wires that come off the fuel and ignition

relays go to an ignition live?

Edd

[C_W 3 1 Cars]

Leave the relay and fuses in the 405 alone and make sure the main power for the loom (at the "end" of the loom with thick white wire) is plugged into the power distribution box on the slam panel (its like a chunky blade fuse fitting); it just slots in a spare slot.

 

The relays are switched buy the ECU AFAIK, or maybe another little wire that plugs under the dash. Im not an expert on this but I redid my loom late last year and basically its a process of elimination after you wire up the dash gauges you're left with only a few wires for the ignition (starter wire, coil wire to rev counter etc.)

[Edd-XS 0]

Ah ha! Again CW youve shed another ray of light on a still rather murky situation. I thankyou!

Gonna do a search about sorting out the oil presure gauge and where to fit the sender as this is vital IMO to have in the 205! Didnt even realise the 405 loom didnt have one incorporated, only oil level and oil pressure warning lights...

Edd

[midnight motorsport 0]

Ah ha! Again CW youve shed another ray of light on a still rather murky situation. I thankyou!

Gonna do a search about sorting out the oil presure gauge and where to fit the sender as this is vital IMO to have in the 205! Didnt even realise the 405 loom didnt have one incorporated, only oil level and oil pressure warning lights...

Edd

 

 

i have done a few of these now and i have found that making a hybred loom from both the normal 1.9 loom and the mi16 loom works best for me,

 

basicly all the sensors to run the gauges, the altanator charge light, and engine stop light, etc are the same,

 

so i stripe both looms of thier tape, you then find that all the sensor wires go down to one plug and a few wires go to the other plug, so i use the plugs and all the wiring from the original loom, lay this alongside the mi loom, then it only leaves a few wires to conect, i use the original constant live (on the bulkhead, BROWN wire) and solder this to the constant live on the mi loom about half way up the loom, then use the earth from the the original plug(loom) and solder this to the mi16 coil earth, then there is a swicthed power, again solder this about half way up the mi loom, and then the fuel pump wire, (both are normally white) and the coil feed for the rev counter,

 

its a bit hard to explain, but basicly, i use the original plugs and loom from the 1.9, run all the sensors and guages , then just splice in the 3-4 wires needed to make the engine loom work,

i managed to get the ecu in the original place, and got all the fuses and relays in the cabin, just under the center console, looks facory, and i only needed to cut and solder 4 wires!!!

 

if you strip both looms down you will see that its almost 2 seperate looms, one for the acctual running, and the other to do all the guages and sensors,

 

not sure if this helps, as its a bit hard to explain, but thought id have a go,

[C_W 3 1 Cars]

I've found that with both my 405Mi16 looms that the fuses and relays (in the original black fusebox) sit nicely on the drivers inner wing (with jack removed of course) with the perfect length left to route the loom through the bulkhead to the ECU .

 

Not the best picture for showing this but you can see the box on the inner wing

[Edd-XS 0]

Cheers for the help guys! Midnight-motorsport it happens that ive done almost exactly what you suggested and stripped both looms down and re-made them into new loom similar in design to the 205 one. Hopefully the relays are positioned far back enough to be able to keep them inside the car but will get something sorted for them if not.

Ive wrapped it all in red fireproof PVC tape aswell so with the gloss black block and shiny ally head it should look quite neat!

found a few stray cables though when stripping the 405 loom back. One thick black (looks to have two cables inside it) and a blue and a yellow... All the sensors are done, any ideas what these are? I cant see a number anywhere without taking the ECU plug apart...

Thanks again for all your help

Edd

[Miles 331 1 Cars]

Any thick black cable with wires in are normally for either the TDC sensor or the Knock sensor, A thin blue is just another starter circuit which you don;t need only the thick blue.

How many rows of pins does your ECU have?

[Edd-XS 0]

Its a 2 row loom from a 1989 Alloy sumped Mi16.

Would have liked the 3 row but if it works im happy!

Thanks for sorting out the beam for me too miles. Bit rusty but seems to be all good!

Edd