Loom question

[Quinten]

Now things are moving on I'm getting myself familiar with the loom that comes with my engine

Everything is neatly labeled up so no issue there, except for the connector(s) in the right hand bottom corner

I'm assuming the 'loose' connector normally connects up to the Westfield wiring loom?  What about the cut off bunch of wires?  What would they be for?

[Kingster]

They might be for the fuel pump and maybe a feed to your tacho? Most ECU's prime the pump then cut the feed until required. 

[Quinten]

Hmm, that does ring a bell somewhat.  It's an MBE ECU.  Going to be an interesting time decyphering that and making a loom up for it 

[Kingster]

Which MBE? I have the 967 so might be able to help as I have just removed it this weekend.

[Quinten]

That's the funny bit...  I don't know    Could not find it in my email trails, and I haven't really studied the ECU up close yet...  It was kind of low priority with all the other work involved in swapping engines 

[Dave Eastwood (Gadgetman) - Club Chairman]

The 967, depending on who made/supplied the loom, normally has a tacho feed, fuel pump feed, and sometimes a shift lamp feed. It then has a 12 Volt in, an ignition live 12 Volt in and sometimes a ground. (There's often a ground wired to an eyelet near the ecu plug though.)

[Dave Eastwood (Gadgetman) - Club Chairman]

Doesn't look like a normal 967 connector, unless it's just the inner contact block under that heatshrink and it's missing it's normal outer shell.

[Quinten]

4 minutes ago, Dave Eastwood (Gadgetman) - WSCC AO Rep said:

The 967, depending on who made/supplied the loom, normally has a tacho feed, fuel pump feed, and sometimes a shift lamp feed. It then has a 12 Volt in, an ignition live 12 Volt in and sometimes a ground. (There's often a ground wired to an eyelet near the ecu plug though.)

Everything is Westfield supplied, including the loom.  And again, those connections make sense with what I know about the engine.

1 minute ago, Dave Eastwood (Gadgetman) - WSCC AO Rep said:

Doesn't look like a normal 967 connector, unless it's just the inner contact block under that heatshrink and it's missing it's normal outer shell.

You're referring to the plug in the left hand bottom corner?  That plugs into the ECU, and it has the 2 relays and earth eyelet connected to it.

 

Guess I'll dive into the garage tomorrow and find out the model number of the ECU to narrow it down

[Kingster]

Here's the 967

[Quinten]

Oh, that looks rather different.  Mine is much larger and older looking  

[Dave Eastwood (Gadgetman) - Club Chairman]

I'd guess it's an MBE 956 ecu from the '90's, Westfield used them prior to the 967's, which came out around '99 or 2000, I forget which.

 

[Quinten]

That sounds right Dave.  My engine is a 98 Westfield supplied Zetec, so the ECU would be from around then too.

[Quinten]

So indeed, it is the old 956E, which is of course now very old, but compared to my old Crossflow quite modern  

Had another look at the plug, and disconnected the 4 pin connecter which along with the weird round one ends up in a cut off section wrapped in tape.  The 4 wires are brown (perm live), green (fuel pump?  or ignition live?), white/black (tacho?) and black/green (fan switch?).  Can anyone confirm that makes sense?  If the green is for the fuel pump, then I should be expecting 12V on there for 3secs and then nothing until the engine runs?

Finally, the mysterious multi pin plug only has 4 wires into it, and it doesn't connect to the ECU loom.  So I am thinking that I can discard it as it was part of the sellers original loom and he was a bit overzealous with the cutting?

[Dave Eastwood (Gadgetman) - Club Chairman]

I'd have thought brown to be permanent live, with solid green the switches ignition live, then black/green fuel pump and the other tachometer, as you say.

You'll usually have a couple of relays in the loom, the brown feeds the switched "power" side, the output side of one relay typically goes to the ecu, the other to the fuel pump. One relay's coil is switched by the ignition, hence the ignition live, this is the ecu relay, the other relay's coil is switched by the ecu, and this is the fuel pump.

[Quinten]

Yes there are 2 relays in the loom.  I was under the impression the coolant temp sensor (which is part of the ECU loom) would give me a fan switch as well?