URGENT! OMVL/AEB/King 5-8 cyl Injector wiring colours?

[himselfunknown]

Does anybody out there have a wiring diagram or photos of the correct wiring colours for the 5-8cyl OMVL/AEB/King system please? I'm having issues with my system and suspect that it may have previously been marked up incorrectly as the 'spare' connector not used in one bank has the same colours (black and orange) as a used connector on the other bank (and vice versa - red and black).
Cheers!

[Gilbertd]

This is for a 4 cylinder one but the other bank will be the same.

[himselfunknown]

This is for a 4 cylinder one but the other bank will be the same.

Unfortunately those wire colours don't match up to what I have in the loom.

[LPGC]

Doesn't matter if it's a 4 cylinder ECU or 8 cylinder, on an 8 cylinder the same colours are used for cylinders 5-8 as on 1-4.

The wiring to petrol injectors is A Blue / Blue black stripe, B Red / Red black stripe, C Green / Green black stripe , D Yellow / Yellow black stripe. E-H use the same colours in same order.

The wiring to LPG injectors, respectively, is A Yellow and Black, B Orange and Black C Red and black, D Brown and black. Again E-H use the same colours in same order. Edit - I didn't realise these gas injector wiring colours were shown in Gilbert's diagram when I wrote this.

Your post doesn't mention if you're talking petrol injector wiring or LPG injector wiring. Since you mention orange wires I would assume LPG injector wiring which corresponds to either channel B or channel F?

Where OMVL looms differ slightly from some other AEB looms is that the gas temp sensor wires (THINNER orange and black / and THINNER black) are in the same sheath as wires to LPG injectors 1-4, in some other AEB looms the gas temp sensor wires have their own sheath. ECU channels A-D correspond to 1-4, E-H correspond to 5-8. It doesn't seem you've confused gas temp sensor wires with gas injector wires because you've said the orange/black is replicated on the other bank of injectors, while gas temp sensor wiring exists only in the same sheath as A-D gas injectors.

On a 6 cylinder install D and H are (4 and 8 ) are the unused channels. Further on this - Regardless of vehicle manufacturer cylinder numbering convention, with AEB you must connect A-D (A-C on a V6) to one actual cylinder bank and E-H on the other... Especially on older AEB systems, not so much on newer AEB systems unless you need to use the bank trim (as A-D are counted as one bank, E-H as the other.. on many systems these days you can name which cylinders are on which bank, and/or give each cylinder it's own trim).

If you're seeing different colours on petrol injector breaks than blue, red, green, yellow... then maybe the car previously had a different LPG system installed and when the newer system was fitted the installer simply joined onto old wiring. Further on this - If such older system used emulator(s), (this would imply not a slave type system), bare in mind that emulators would turn of petrol injectors whether they were wired correctly (on pulsing wires) or incorrectly (on + feed wires)... but a slave type system (read sequential, like your OMVL / AEB / King) would need the wires connected correctly on the negative pulsing wire and the correct way around (solid colour / striped colour). As I mentioned on your other thread, the only wires that really matter regards fuelling on older AEB systems are the blue / blue with black stripe wires. This means the Cav could have run OK with an old AEB ECU if any of the green, red, yellow wires were not connected properly, but if you then fitted a newer AEB ECU (which fuels on individual cylinder basis) with incorrect wiring on red, green or yellow wires there would be problems like those you're experiencing...

As standard AEB slave type wiring (including OMVL) use 10 pin connectors on petrol injector break looms, one connector per each bank (A-D, E-H). One of which has 8 wires connected (blu, red, grn, yel plus striped equivalents), the other of which has the same colours plus the red with white stripe ignition on wire (9 wires). If some older install wiring has been connected to (none AEB slave/sequential type), then to find if that's been done properly you could: Disconnect those plugs, also disconnect every petrol injector plug. For each solid coloured wire pin in turn in each 10 pin connector, using a multimeter see if there's a connection (near zero electrical resistance) to the pulsing wire of it's corresponding petrol injector. You can find the constant 12v feed wire to each petrol injector because with ignition on it will have 12 volts, the other wire (negative pulsing wire) to each petrol injector will be open with the LPG system multiplugs disconnected.

If VERY urgent you could bring your car in Monday morning and I'd have it sorted in half an hour...

Simon

[himselfunknown]

If VERY urgent you could bring your car in Monday morning and I'd have it sorted in half an hour...

Simon

I think I'm going to take you up on this offer, see you tomorrow!

[LPGC]

Sorted! Himselfunknown visited me today..

A full explanation of what was done here http://www.lpgforum.co.uk/viewtopic.php ... 98#p108498

Simon

[himselfunknown]

Thanks Simon for having a look at it for me and getting it going for me, I really appreciate it!

It went pretty well on the way back with the basic map you did for it. Still undecided whether to stick with the old ECU or put the newer ECU on it and benefit from all the additional functionality. Decisions decisions! But at least now it's running on all 6: a vast improvement!!

[LPGC]

Very welcome, I'm glad we got you sorted.

If there's need to carry on discussion, we'd better choose one of the two threads to use to prevent duplicating all our posts! I've written more on the other thread... but only a bit more this time!

Simon