Alfa Wiring Diagram Needed - Urgently

[Guy Mayers]

Hi all, I need a wiring diagram for the UK Market 1992 164 Cloverleaf with the Bosch Motronic ECU part number 0 261 200 130.

I've spent a week looking for a fault that's causing a no spark at the plugs and haven't managed to find anything yet.

I't almost at the point where I'm going to rip the entire loom out and start again and write another year of use of the car off.

If there is anyone out there with a car that's up and running with this ECU fitted I might well come visit with the current ECU to see if it fits & runs!

Guy

[Guy Mayers]

I found this diagram online this afternoon and I think it matches the loom I pulled from the donor car but there's a sensor I don't recognise yet. It's the third one from the left on the top line, annotated "M15" - does anyone know what this little bugger is? Or if I need it?

Cheers

Guy

[Marcolino]

Hi Guy,

found it in my alfa repair manual. Motronic 3.0 V6 Scheme. M15 is called "Verdampfungs Elektroventil" => Vaporizer electrovalve ?!

Think it is used to keep petrol fumes back in the fuel system ...? Excuse the translatio ...

[Guy Mayers]

Thanks! I'll have to check the remains of the donor car and see if it's still there. I wonder if the engine will fail to run without this little item?

Andrea agrees with your translation by the way!

Guy

[Cadami]

I asked the same question when rewiring my 24V Guy. Seems it's ok to cut it out..

[Strat Fan]

It wouldn't affect the running I'm sure.
It will be the solenoid valve on the vapour recovery canister which seals the tank when the engine is switched off & opens the canister to the plenum chamber when the engine is running.

[Cadami]

I'm assuming you're using a differencet ECU supplied with the engine? Does the fuel pump prime when you switch on the ignition?Have you cut down the original loom Guy? Maybe a faulty crank sensor or the wires are crossed?

[Guy Mayers]

Now I'm really really really really worried. Rechecked all the connections twice this afternoon. Reconnected the ECU to the loom and now there is a spark on each plug. The test light on the fuel pump also glows so the jobs for tomorrow are to lift her up and trace the source of the very slight fuel vapour smell, it's either a weep on a tank or one of the four clamps on the balance pipe. There are a couple of water leaks to close off too then I'll crank the engine for oil pressure, remote prime the fuel system to check for high pressure circuit leaks, fit the plugs and see if she'll fire up.
So, have I got an intermittent connection? The only difference I can see is that the ECU is sat on the floor of the car and not on it's mounting bobbins. If it doesn't fire with the ECU in place I guess it's that the ECU case might need earthing....

Guy

[Guy Mayers]

I'm assuming you're using a differencet ECU supplied with the engine?

Yes Allen, I actually got two with the donor, a standard one and one marie "Chipped" which I'll try once the engine is run in.

Does the fuel pump prime when you switch on the ignition?

Pump isn't connected yet Allen but the test light comes on with cranking on the starter. That circuit dies once the starter is disengaged but there's a second power supply in the ECU/Relay circuitry to supply power once there is oil pressure.


Have you cut down the original loom Guy?

I compared the original loom in the Stratos with the donor on the workbench. There were significant changes between the two but it was still easier to disconnect the redundant wires, plumb in new ones where needed (Lambda) and re-order connections in multiplugs as needed on the AFM to match the donor loom than remove the entire loom and replace with a cut down one from the donor.

Maybe a faulty crank sensor or the wires are crossed?

Definately not! checked, double checked and once again just to be sure! Plus new crank sensor fitted as the old one showed a very slight nip!

Guy

[mel lewis]

Have you got "Home Start" ?