Emerald wiring to a vr6

[legvw 0]

Anyone wired an emerald ecu to an obd1 vr6 loom? Was there any problems, or was it easy enough? And has any1 got a wiring diagram to do this?

[spadam 7]

raddostorm will be your best bet as he has emerald management on his corrado. Are you going to get it mapped by JKM in portmsouth then.

[Radostormvr6 2]

raddostorm will be your best bet as he has emerald management on his corrado. Are you going to get it mapped by JKM in portmsouth then.

Speak to keith at JKM he fitted and mapped mine.

[legvw 0]

Yeah might get them to map it, but i'm gunna wire it in myself, saves the £! I'l give him a ring tomoz them, cheers :-)

[bungy 2]

Nice to see you earlier buddy and the work you've done so far is very impressive. You've definitely got some skills, shame I know nothing about Emerald but vrsick might be able to help.

[legvw 0]

Cheers mate, i'm gunna ring keith tomoz, and emerald, see if they can help, but was good to see another local ;-)

[FishWick 21]

I doubt JKM will give you the wiring details over the phone, they'll want some money from you.

It's p1ss easy anyway. I've wired my DTA into the an OBD1 loom and also done a DTA loom from scratch, bypassing all the VW wiring completely.

I'll try and list what a I remember as some wiring varies across the cars:-

In ECU plug harness:-

Yellow/Blue - Fuel pump relay trigger

Grey/Black - ECU +12V relayed power supply

Green/Black - RPM signal for tacho

On coilpack:-

Purple/black - Coils 5/2

Blue/Black - Coils 3/4

Brown/black - Coils 1/6

And the the thick black wire is +12V supply, which can also feed the injector positives.

Knock sensors - You won't need as Emerald doesn't support it

Crank signal - White plug on front engine mount, use the VW wire and reterminate at the Emerald end.

Cam signal - Only use if you want to run sequential injection, but ditto above and the VR6 cam sensor needs a 12V supply, not 5V ;-)

Injectors etc are easy to trace with a beeper on a multimeter or peeling back the insulating tape and tracing back the colours.

For batched injection, pair together injectors 1/6, 3/4 and 5/2 on 3 injector drivers.

For sequential you'll need a driver for each injector and remember, the Emerald firing order is 1, 2, 3, 4, 5, 6, so the physical wiring needs to be done like this to match the VR6's correct firing order:-

Emerald driver 1 = Injector 1

Emerald driver 2 = Injector 5

Emerald driver 3 = Injector 3

Emerald driver 4 = Injector 6

Emerald driver 5 = Injector 2

Emerald driver 6 = Injector 4

The crank sensor wire goes up the chassis leg as 1 continous length, but the other engine wires terminate at the round connector above the water pump and I would also terminate your emerald wires there.

There really is nothing to it mate. Some firms charge a bloody fortune for fitting and mapping ECUs but there's no need for it.

All the wiring stuff you need is online and there are some Emerald VR6 maps here (inc turbo) - http://k80rum.co.uk/emerald_maps.aspx

[legvw 0]

Cheers kev, some usefull info there. I think my coil has different colours to that? Is there anyway of checking which wire fires what?

My prolem is that i look at wiring and see it as a daunting task! So many wires, and not wanting to blow anything up is always at the back of my mind!!

Getting the ecu off to be sorted on saterday, when its back let the wiring comense!

[FishWick 21]

Is yours a coilpack one?

If so, on the coilpack lift off the black cover that the loom clips into and you'll see 4 binding posts. Pin 15 will be a switched live and the other 3 will be the low tension signals. I may have muddled up the orientation but the post nearest the front of the cat is coil 1/6, the middle one is 3/4 and the rear one is 5/2.

Hope that helps!

Wiring can be daunting at first but it's really easy in practice :-)

Emerald can supply you with an unterminated loom for a reasonable price, which I would recommend you use. Dave Walker is also more likely to help you that JKM if you buy an ECU and loom from him ;-)

[legvw 0]

Yes its coilpack, and had a look today-didn't realise that cover came off!!

And your defo right about jkm, left a msg monday, still no reply. Been email emerald and they are SO helpful, it just makes life so much easier :-)

[FishWick 21]

Yep, the guys down at Emerald are superb. Go to them direct, they know more about their own product than JKM anyway and Mr Walker himeself mapped quite a few VRTs ;-)

[legvw 0]

Well ecu should be here today!

Kev, do you know if the vr needs a tacho driver? Or will it run direct off the ecu?

Thanks for your help btw :-)

[FishWick 21]

Good stuff!

The tacho signal comes from the ECU, or it should do at least! You need to set it to output 3 tacho pulses per rev and the thin green/black wire in the ECU harness is the input for the rev counter ;-)

[legvw 0]

Got a bit stuck, got 3 earths going to the ecu, brown/black, brown, brown/yellow, do i have to use all of these?

Also red/blue is constant live, another larger red/blue dead. Black/brown constant live too. Which 1 do i use for +12v for the ecu? I've worked out the switched power, black/green, does it need another power or will 1 be ok?

[FishWick 21]

The switched live from the ECU relay on my OBD2 loom is black / grey and that's the one I use to switch my DTA. That's what you need to find.

As for the earths, the Emerald only needs one of them and I think from Memory the plain brown one is the best one to use. The other 2 could be signal grounds, have you traced them back to their source?

[legvw 0]

Yeah looking at it tonight, and think the brown/yellow is from the engine, so i don't need to connect it? Would it be worth just earthing it out somewhere? Or just connect it with the other to the ecu?

[UnitedMotorsport 55]

The best earth wire to use is the thicker solid brown wire that goes to pin 1 on the standard ECU.

The red/blue wire that goes to pin 54 of the standard ECU is permenant live - If the emerald requires s permenant live, this is the one to use.

Switched live is black/green that went to pin 38 of the standard ECU.

The thicker red/blue you mention that is "dead", this is swtiched live controled by relay. The black/brown that you mention that is constant live - this is the wire used to trigger the relay. This relay is the "Motronic control relay" and is in position 3 in the fusebox.

[legvw 0]

so that black/brown just goes to earth when the igniton is switched on, switching the red/blue to live-power to the ecu?

the emerald requires a switched live btw.

[UnitedMotorsport 55]

Providing the black/brown wire is the correct one, taking this to ground will trigger the relay and put power on the red/blue. On the standard OBD1 ECU this is used by the ECU to turn power on to the sensors, ie MAF.

Switched live is the Black/Green that went to pin 38 on the standard ECU.

[legvw 0]

Thank you, think i've sust it, the thing that was doing my head in was that the black/brown switched the relay on when earthed, but stayed on when the igntion is turned off. I thought it was meant to turn off with the key.

Solved it by using the black/green to power another relay, which switches the black/brown on to switch the main ecu power. Then i can use the larger red/blue to power crank, cam lc-1 and ecu.

[UnitedMotorsport 55]

The relay wouldnt have turned off when you turned the key off as permenant live feeds this relay.

[legvw 0]

Right, think i might have blown my crank sensor, or wired it in wrong.

Check wiring and its going to what emerald recommend, i think?

I've got a black, red and green, the black going to pin 32, red going to pin 14, green going to pin 31.

Pin 32 being the mian trigger sensor earth, 31 crank sensor signal, and 14 +8v supply for external sensors.

I had wired in as a +12v to the red, which makes me think i may have blown it, because now i've wired it as a +8v supply it won't work.

Can any1 help with this please? Any1 had any similar problems etc?

[FishWick 21]

You've wired the crank sensor as a Hall sensor mate, it needs to be wired as an inductive. Refer to page 55 of the manual.

Needs to be like this mate:-

31 - Signal - Green or red

32 - Signal Ground - Green or Red

30 - Shield Ground - Black

I can't remember with the VW wiring which is the signal, but connect a voltmeter to the sensor and wave a bit of metal in front of it and it will show a small voltage on the signla wire. That's the one that goes to pin 31 on the Emerald.

[legvw 0]

Yeah think i sust it finally yesterday, after buying a crank sensor i didn't need as mine still works, yay!

You are right about the wires, black is going to chassis ground now, and think i've put the green and red in correctly as the ecu is reading a signal. I did swap them over to check, and it wouldn't read a signal.

The emerald wiring diagram was slightly misleading, as it shows an inductive sensor as having 2 wires, and a digital as having 3, which made wire it in wrong.

Thanks for your help kev!

[legvw 0]

Oh kev, don't suppose you know the correct wiring colours for the cam sensor, as i'd like to run sequential injection?