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[Doctor Gollum]

Look closer. The terminals are numbered at each end of the row.

If it's the Vectra harness, then it's not correct for the Omega ECU.

[Eyal2002]

Look closer. The terminals are numbered at each end of the row.

If it's the Vectra harness, then it's not correct for the Omega ECU.

My counting was based on these raised numbers at the beginning and end of rows. I got Pins 4 and 45.
Thing is, other things will not work, specifically rear multi-ram (that does work). I need 2002 Omega wire diagram, none available in OOF or Hanes afaik.
As for the ECU, I put both versions on the current one in the car, and the one from the parts Omega. They look the same.

[Eyal2002]

What is the vacuum line to the intake above the maf? Also, I know it is lhd, but where are the vacuum lines for the multirams? They should be clipped to the cable tray as there's nowhere else for them to go...

I would politely suggest that whoever fitted that engine didn't do a particularly good job 

A quick scootch does suggest that that's the Omega ECU... However the botched in IAT sensor (the 2.6/3.2 Omega uses a combined MAF/IAT) suggests that there are other things going on.

I would strip it all off and fit the donor parts from the other Omega.

Well don't run into conclusions, set is for troubleshooting (VAC, solenoid plug etc), and when all works it will be back in place. Anyway hope this drawing will clarify things:

[Doctor Gollum]

They are the same.

The difference/issues will be with the wiring harness if they used the Vectra engine harness.

The pin rows are all numbered on the socket. If you zoom in your picture you can see them. Also what you are interpreting as pin #45 is in fact pin #53.

The plugs are numbered in a similar fashion where the wires enter them.

From memory, with the ECU correctly installed, the top plug is the engine loom only. The bottom plug is the Body harness.

[Doctor Gollum]

Who on earth  fitted that like that?

[Eyal2002]

They are the same.

The difference/issues will be with the wiring harness if they used the Vectra engine harness.

The pin rows are all numbered on the socket. If you zoom in your picture you can see them. Also what you are interpreting as pin #45 is in fact pin #53.

The plugs are numbered in a similar fashion where the wires enter them.

From memory, with the ECU correctly installed, the top plug is the engine loom only. The bottom plug is the Body harness.

Did you remember to "mirror" the socket image?
Knowing the old mechanic, he prob disconnected all plugs from old engine and just planted new one instead, same loom, the whole inlet "bagpipe" is original.
Again, lots of things wouldn't work if a Vectra loom was used. But who knows maybe a wire was cut and reconnected to something else (but then you will get the wrench dash icon).
Bottom line the entire car works - except from Multiram - and no one can blame solenoid/vacuum/setup as it works when ground is given to the from solenoid.
I am more than ready to research wires, just need the proper wire diagram please.

[Doctor Gollum]

I did. The opposite end is pin #64

[Eyal2002]

I did. The opposite end is pin #64

When you are right you are right. My bad, low on coffee. Pin#53.

What are the chances you or other OOF admins can get the 2002 V6 wire diagram?

I doubt Opel/GM has anything here in Israel, I might have the last Omega here. But if you have connections with UK Vauxhall...
Cheers

[Eyal2002]

Got it!!! (sleep is overrated ) I got the original PDF but it's in Russian, PM me if you want it.
And it confirms pins 4 and 53. So back to square one, why the ECU will not command the front multi-ram to open.
Anyways here are the drawings for OOF reference:

[Eyal2002]

Good news - Both Multi rams work!!!
In fact, since the rebuild of the vacuum system everything worked, but...  As per the "Vauxhall College" document, there are expected RPM points in which you expect the Multi ram to engage, however these points are not correct for the 2.6L and thus misleading.
Starting with the rear MR, it works only above 4100 RPM, and ALWAYS turns on at that RPM when testing (a person steps on the gas while I flash a light at the actuator). This constant response confused me as the front MR NEVER WORKED no matter what RPM WOT etc., even though vacuum, solenoid, wiring, all verified OK separately.
So tonight I plugged a voltmeter in parallel to the front MR solenoid, put it under the wipers facing driver seat - and went for a ride in only 1st and 2nd gear:



I wish I had a better way to document with a picture, but here's what happened: Every time I accelerated HARD the front MR got full voltage, and it was seen in as low as 2800 RPM. Under very slow or no acceleration it was off. And of course, the biggest confusion - never works in parking. So the only easy way I came up with is to test it under driving load, and clearly the results are way different than the "Vauxhall College" explanation of Multi ram, and I can only assume the 2.6L/3.2L has totally different Multi ram operating schema.

Does anyone has actual ECU "rules" for the Multi ram in the 2.6L?

I thought my car is fantastic because the rear MR got fixed and working - turns out they both were. Hard to believe a 20 years old car accelerates and drives so smoothly. Thanks for all who helped!

[Doctor Gollum]

Glad it's sorted