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Feb 15, 2012 14:18:47 GMT
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Does anyone have a wiring diagram for a BOA engined granada or at least an ECU pinout? (1993 model, ECU code BABY) I'm in the middle of wiring said engine into an XR4i, and I'm not getting any response from the ECU on cranking - EDIS is making sparks, engine runs if you feed it easystart, but no pulse on the injectors and no reply from the ECU to EDIS on the PIP/SAW lines. Trouble is, the guy who removed the engine from the granada sawed the engine loom in half  I've reconstructed it based on one of my granada looms but mine is earlier (1991, ECU code 1GAA) and I'm wondering if there is a difference between the two - neither are PATS immobilized, and the plugs and physical wiring appear identical, ECU has power and earths in the same place as mine, but no go. Also, Autodata doesn't have any data. ABS and aircon wiring only.... |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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johnna
Part of things
Posts: 46
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Feb 15, 2012 14:48:15 GMT
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Feb 15, 2012 14:55:52 GMT
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If that helps me out you win a vid of a cosworth engined LSD equipped 4i leaving smoky black 11's on the lane  |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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johnna
Part of things
Posts: 46
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Feb 15, 2012 15:10:49 GMT
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If it works I'll come up and take the vid!
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mk2cossie
Club Retro Rides Member
Posts: 2,953 
Club RR Member Number: 77
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BOA cosworth ECU wiringmk2cossie
@mk2cossie
Club Retro Rides Member 77
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Feb 15, 2012 18:20:47 GMT
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what kind of granada is it in? as i believe the injection pump relay is feed from something on the original coil to disrupt the pump relay when the engine dies  and i take it you have an ignition feed thats there whilst cranking as well ;D |
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Feb 15, 2012 18:28:23 GMT
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It's in a sierra....
And the original (pink) fuel relay has been replaced with a simple relay already, and yes I have a feed while cranking.
Checked and double checked the loom, all essential ecu pins go to the sensors and actuators that they should go to but still no go. I'm leaning towards a dead ECU, but I don't want to plug one of mine in just in case. Tomorrow's job is to fit my loom and ECU and see if it runs like that, then swap the suspect ECU onto a known good loom (ie mine) to check it.
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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mk2cossie
Club Retro Rides Member
Posts: 2,953
Club RR Member Number: 77
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BOA cosworth ECU wiringmk2cossie
@mk2cossie
Club Retro Rides Member 77
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Feb 15, 2012 18:59:27 GMT
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wasnt a telling off, just a nudge as i know its been done before ;D if its running on easy start, it is getting the spark sorted by the ecu which would imply that its working ok (or at least the edis6 part is) did you do the install in the sierra yourself or is one that you have been given to finish off? not just the fuel feed?return on the fuel rail the wrong way? |
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Feb 15, 2012 19:13:34 GMT
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Don't worry, it pays to state the obvious sometimes, I didn't take it as a telling off! and in that vein - an EDIS unit will generate a useable spark even with no ECU at all just from the crank sensor signal. Advance/retard is done by communication with the ECU on PIP/SAW - this isn't happening. Also, the injectors are not pulsing so it's irrelevent (at this point) which way round the fuel lines are. And yeah, it's a dumped on me "can't do it" sort of job.....  |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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johnna
Part of things
Posts: 46
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Feb 15, 2012 22:16:16 GMT
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Rare for an ECU to die though...
Now for my stating the obvious moment.
What about the power relay? (Yellow I presume?)
I've fiddled with eec-IV a bit (took advice from Bortaf) and I know that it was adapted for the 2.9 12v and then developed further for the Cossie by Ford before they added the immobiliser.
I had a sierra loom that had a knackered power relay and the results were fairly similar to those described.
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Feb 15, 2012 22:28:25 GMT
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well, my power relay is pink, but only because I got it out of a random box of relays when I made the power section of the loom... But, yes, I did check that, it's doing its job. All power wires and earths are where they should be, but the ECU might as well not be there - it's doing nothing, and I agree that ECU failure is rare, except for water damage. That's why I was wondering if the later (BABY rather than 1GAA) ECU needs another pin taken to ground or power to work - some sort of inhibit from an alarm or gearbox perhaps. I'm also pretty familiar with EEC-IV in general, I use it a lot on zetecs |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Feb 15, 2012 22:41:57 GMT
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Wait, hang on, I'm remebering something from years ago... I had 2 24v granada scorpios, one was a K reg (1GAA ECU) and one was L reg (BABY). I got the L reg car cheap because it wouldn't start - ECU was water damaged on the socket end. I cleaned up the plug and tried the ECU off the K reg car, but it still didn't work. I didn't look any futher into it and broke the car for spares.
I'm really starting to wonder what the difference is....
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Maybe whip the ECU open and confirm that stuff like the injector drivers actually routes to the injector pins, and crank sensor gets routed to some kind of hall sender IC? etc. It's a bit  about face, but it's got me out of the curse word a few times when I've got no reliable diagrams. |
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Feb 16, 2012 11:44:30 GMT
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On some rovers, it's common to "kill" the earth to the ECU internally (that's what happens when the earthed ECU case is right next to the positive battery terminal I suppose!)
Might be worth lobbing on a wire from the ECU case to earth, just in case something similar has happened? Five seconds with a jumplead
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You're like a crazy backyard genius! |
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Feb 17, 2012 17:17:36 GMT
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Well, I got it working  - for the record, there is no physical difference between early and late BOA ecus, they are interchangeable. What I did today was this - I unplugged the engine from the loom, and used another loom and ECU to run the engine - I got an injector trace straight away, and it ran once I swapped the fuel lines around - next, I used the car's ECU on my loom, once again ran fine. Tried the original ECU and loom again, nothing..... wierd. Then I spotted that someone had plugged the EPT sensor input (part of the EGR system) into the level sensor for the coolant expansion bottle....... Pulled that plug out, and it works.  Here's its injector voltage trace with the engine idling. Moral? Never let anyone else fit a loom you made, and never assume that everything is plugged in correctly |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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Feb 17, 2012 23:04:53 GMT
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which way does the level sensor work on those? Imagine if it worked fine til you topped the tank up.
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Feb 17, 2012 23:17:26 GMT
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no water in it at all yet, it's missing a top hose! Far as I can tell, the ECU didn't much like getting the 12v sensor feed straight back on the signal wire and shut down to protect itself - wire wasn't carrying any current cos I didn't lose a fuse or fry any wires, and now it's unplugged it all works how it should.
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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I've reconstructed it based on one of my granada looms but mine is earlier (1991, ECU code 1GAA) and I'm wondering if there is a difference between the two - neither are PATS immobilized, and the plugs and physical wiring appear identical, ECU has power and earths in the same place as mine, but no go. 
- for the record, there is no physical difference between early and late BOA ecus, they are interchangeable.