DaveFJ
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 posted on 16/5/16 at 10:43 AM |
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Megasquirt dead ? :(
Was running the car a little a couple of weeks ago - trying to get her ready for the summer... when she just died. Now have nothing - wont start and
fule pumps don't run.
Started off looking at the Loom and have actually re-worked all the engine bay wiring as it was a bit of a mess.
However, still nothing
have proved that the pumps will run if power is supplied and that the fuel pump relay is working OK.
Have continuity for wiring back to MS
Confirmed that I have 12v supplied to correct pin on MS
Tried connecting a laptop to the serial port on the MS and cannot connect.
tried port checker and it cant make a connection either
so have come to conclusion that my MS may be dead
I do however have another issue which started at the same time but I cant see how it is related to fuel pumps not running:
Engine wont turn over I can occasionally here the starter relay click over but not always, can see a voltage drop when i try to start. but engine
does not run over.... like i say -0 i think that is a separate issue and haven't started on that yet - just interesting it started at the same
time as the other issues
So..........
Does anyone have a suitable STIM and could maybe test my MS to see if it is truly dead?
It is a V3 board running as MSnS running MSExtra code so no EDIS unit involved - driving a Zetec coil pack on my 2.1l Pinto.......
Unit is about 9 years old
Dave
"In Support of Help the Heroes" - Always
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gremlin1234
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| posted on 16/5/16 at 11:24 AM |
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first thing I would check is if there is 5volt on the board.
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coyoteboy
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| posted on 16/5/16 at 12:00 PM |
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Yeah get it open and see if the main fuse or power circuit has failed internally - should be an easy fix if the fault that caused it has been
removed.
[Edited on 16/5/16 by coyoteboy]
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DaveFJ
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| posted on 16/5/16 at 12:48 PM |
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OK... I'm an electronics numpty 
Needless to say I bought this fully built by someone competent!
So... any indication where I should check between on the main board for +5v ?
I can just about wield a multimeter but when faced by a circuit board like this my mind runs away to hide in its happy place!...
Dave
"In Support of Help the Heroes" - Always
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DaveFJ
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| posted on 16/5/16 at 12:50 PM |
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quote:
Originally posted by coyoteboy
Yeah get it open and see if the main fuse or power circuit has failed internally - should be an easy fix if the fault that caused it has been
removed.
[Edited on 16/5/16 by coyoteboy]
I did notice when re-working the wiring loom that the diagrams call for the main supply to have a 2amp fuse and I, for some reason, saw fit to use a
5amp instead
Dave
"In Support of Help the Heroes" - Always
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gremlin1234
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| posted on 16/5/16 at 01:52 PM |
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quote:
Originally posted by DaveFJ
OK... I'm an electronics numpty
Needless to say I bought this fully built by someone competent!
So... any indication where I should check between on the main board for +5v ?
I can just about wield a multimeter but when faced by a circuit board like this my mind runs away to hide in its happy place!...
the are a few
places marked on the board as 5v,
BUT, this is not the place to learn electronics. as when it is running it is safety critical. (the engine will stop!)
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theduck
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| posted on 16/5/16 at 06:11 PM |
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Have a word with ExtraEFI or James Murray Engineering.
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DaveFJ
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| posted on 16/5/16 at 07:40 PM |
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Not trying to learn electronics just want to see if the MS is toast......
anyway.. the only place i could find +5v on the board was at the top of the proto area...
just tried testing from there to the Gnd next to it and get 0.51v ....
Tested the pin at the 37 way connector and currently have 11.89v there
conclusion? As I said in my first post, think i need someone with the right setup and STIM to test it properly.. Just knowing what a great bunch of
knowledgeable guys we have on here I thought I would check if any of you had a test rig before going down the potentially expensive route.....
Dave
"In Support of Help the Heroes" - Always
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coyoteboy
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| posted on 17/5/16 at 11:39 AM |
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Find polyfuse F1
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/v3board1.gif
Check for voltage either side of it. If you don't get 5v at either side of it, check for power at Pin1 of U5. Report back
Everything on an MS1 v3 board is replaceable by a monkey with a club fists - I'm pretty sure we can diagnose and instruct a repair The
problem is if the fault still exists it'll be trickier to track down.
[Edited on 17/5/16 by coyoteboy]
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DaveFJ
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| posted on 17/5/16 at 07:47 PM |
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OK...
Both sides of polyfuse F1 read +0.5v ....
Pin 1 on U5 has nothing at all
I would question my multimeter or my stupidity but I get 11.89v at whatever pin that is in the 37 way plug (i opened it up to be certain which
connector the red wire was connected to )
Any ideas ?
much appreciate the input so far!
Dave
"In Support of Help the Heroes" - Always
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gremlin1234
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| posted on 17/5/16 at 08:02 PM |
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0.5v on the input indicates a fault on the psu side of things, - hence you don't need an ms specialist to help fault find, it's (probably)
before it gets that technical.
I shall try to take another look at the ms v3 schematics to see any likely fault that might bring input 5v to 0.5
edit: do you have any higher res pictures of your board? so we could look for scorched components and such like?
[Edited on 17/5/16 by gremlin1234]
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DaveFJ
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| posted on 17/5/16 at 09:06 PM |
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I can take more pics... I had a good look for any scorching and also took the board out and looked at the other side... couldnt see anything
Dave
"In Support of Help the Heroes" - Always
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coyoteboy
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| posted on 17/5/16 at 09:44 PM |
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Voltages on this what you have?
 
Potential fails
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BaileyPerformance
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| posted on 18/5/16 at 07:36 AM |
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We can repair it for you if you like?
We build / modify / repair / install megasquirts
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Chris_Xtreme
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| posted on 18/5/16 at 07:54 PM |
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I'd thoroughly recommend Bailey Performance....
on another note, I have a stim which worked to test mine a while back, Geoff from on here, used to have the v8 viento wilkingj made it.
don't ask me if it is what you need tho!
I'd post it to you for 30quid.
pic of stim
[Edited on 18/5/16 by Chris_Xtreme]
[Edited on 18/5/16 by Chris_Xtreme]
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DaveFJ
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| posted on 18/5/16 at 09:32 PM |
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No garage time now until the weekend,,,, but will report back my findings as soon as i can spend more time on it
Thanks for all the advice...
My current thinking.... I have a couple of things to check further and may well take you up on the STIM...
If i prove that the MSnS is dead then I will see what you guys at Bailey can do to hopefully repair it
I have had one thought.... bearing in mind that I also cant get the engine to turn over....
Could I have toasted the battery in some way? I have checked it is pumping out 12v and have had it on a trickle charger.... The rad fan works (i
have an override switch) and lights work... but just wondering if it could still be knackered? going to try to get hold of another batt to test
with - although the wife is oddly reluctant to let me take the one out of her mercedes.. cant imagine why!
cheers all
Dave
"In Support of Help the Heroes" - Always
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Schrodinger
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| posted on 19/5/16 at 07:25 AM |
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You haven't disconnected an earth lead by any chance?
Keith
Aviemore
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DaveFJ
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| posted on 19/5/16 at 10:14 AM |
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I did check them all after I reworked the engine bay wiring.. but it is on my list to check everything again.... you have me thinking now and
doubting myself!
I rewired the Alternator and to get at it had to remove the engine earth strap.... I'm sure I would have put it back!!!!
Dave
"In Support of Help the Heroes" - Always
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rusty nuts
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| posted on 19/5/16 at 06:38 PM |
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Don't take the battery out of the Merc , it'll probably cause you all sorts of grief with lost codes etc
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DaveFJ
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| posted on 19/5/16 at 07:57 PM |
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as it turned out - i did get a little garage time tonight
Good news is I am not a total numpty and i did reconnect the earth straps to the engine!
So...
checked all 5 earths coming from the MSnS - all good.
carefully checked all wiring in the plug - no issues i can see
tried checking all above again - no dice
as for the turning over issue... gave the solenoid a whack and can now here it click but still no attempt at turning over. removed plugs (managed
to snap ceramic on 2 whist doing so! god they were tight!) and turned engine over by hand - so it isn't siezed at least!
intend to remove starter motor at weekend and see if there is another issue there....
As for the MSnS...
Think I might just send it off to be checked...... at least I can be sure then....
cheers for all your advice guys
Dave
"In Support of Help the Heroes" - Always
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DaveFJ
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| posted on 21/5/16 at 03:55 PM |
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Just fitted brand new Odyssey battery... still no joy...
going to contact Bailey and ship my MSnS to them to check/repair
A big thumbs up for Tayna batteries BTW... New Odyssey 680 battery. order at lunch time yesterday and delivered at 9am this morning! £85 including
delivery
[Edited on 21-5-16 by DaveFJ]
Dave
"In Support of Help the Heroes" - Always
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DaveFJ
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| posted on 22/5/16 at 10:33 AM |
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Well I have an answer on the starter motor anyway... Its fubar!
tried to get ti to turn on the bench but nothing
cracked open the casing and large chucks of copper started falling out!
I can see that quite a few of the thick copper wires that run up to the windings have disintegrated....
so - Now looking for a replacement on eBay....
well that's one mystery solved at least!
strange coincidence that it should fail at the same time as the apparent failure of the MsnS !
Dave
"In Support of Help the Heroes" - Always
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mark chandler
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| posted on 22/5/16 at 11:26 AM |
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If the engine is not turning over megasquirt may appear to be dead as no revolutions causes it to shut down, best get it cranking first.
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coyoteboy
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| posted on 23/5/16 at 11:27 AM |
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Fuel pump would kick in anyway, default action is to prime the pump (unless it's been disabled for some weird reason).
If there's 12v across the incoming pins of the MS at the DB37, it's the MS PSU that's at fault.
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DaveFJ
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| posted on 23/5/16 at 12:39 PM |
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Now dispatched to Bailey Performance for check/repair...
Dave
"In Support of Help the Heroes" - Always
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