Hi Folks,
I recently purchased a 1996 143 500hp.
My mechanic accidentally crossed the jump start cables on the battery the other night.
The truck will not start since.
I have taken out the ECU and this looks to be fine.
Anyone have any suggestions please?
Thanks,
Eddie
Take it to Scania and give him the bill? Un helpful suggestion i know, but it could be a costly mistake.
The obvious things would be check every fuse/ relay on the truck, but i guess you’d of already done that. Sorry you got troubles. 
Does it spin over? or is it dead, if dead could be he has just goosed the batteries…
Relays. fuses, should be a main fuse somewhere as well…
Best bet like Mr V said is call Scania and let mechanic foot the bill, jump starting a truck is very risky now unless you know exactly what you are doing, as you may have just found out…
On DAF,s always jump em with the sidelight and head lights on, this stops the power surge from buggering up the ECU, did the mech have any lights on when he jumped your Scanny??..
Good luck.
Cheers Folks,
yes the truck will turn over, but will not start.
taking to scania is not an option i’m afraid.Mechanic is a buddy:(
murphe5:
Cheers Folks,
yes the truck will turn over, but will not start.taking to scania is not an option i’m afraid.Mechanic is a buddy:(
cant be much of a mechanic if hes got the cables the wrong way round on ye batteries.
Tell him to get it sorted, he effed it up… maybe hes soon to be an ex buddy…
sorry for ye troubles
Poss its a fuse or relay, maybe on the fuel cut off circuit… Any warning signs on the dash??
Most prob its the ECU, it does not need to be burnt out to be ruined, poss VERY expensive from Scania and will need fitting and re tuning to your truck…
Using buddies as a mechanic is not a good idea, as you may have found out, not a cheaper option is it 
Let me know how you get on…
Thanks Guys,
Looks like this is going to bo one big headache
I’ll keep you posted.
Cheers,
Eddie
Check all the fuses, see if Scania will tell you whether theres any circuit protection for the ECU.
After that look for a ECU doctor firm on google and chat to them, if you give them the details off the ECU
label they should be able to tell you if they can test it for you.
Place I normally use charges about £30 for testing [you post it to them] and quote a price if they can fix it.
Another option would be to try a good ECU from a running truck of same spec. [if you can find one willing]
Good luck, let us know how you get on.
Hi Murphe5, there might be a chance that 1 of the wires could’ve burned out. Friend of mine had a 470 G plate which i’m thinking will be the same set up as yours, electronically controlled, anyhow 1 day it wouldn’t start for love nor money!!! Like yours it was turning over but not firing, he calls Scania out who plug in the lap top but can’t trace the fault, the finger gets pointed at the ecu but that’s checking out ok, so they say it’s his fuel pump, all my friend can think of is a mounting bill, the pump when taken off the truck was found to be working fine. Long story short he sends his truck to a garage in Widnes that specialise in Scanias, turns out a wire in the head lining had corroded & broken, wire replaced truck worked fine. Although his problem came about different to yours it could be worth checking the wires. Have you bought the truck to run or is it part of a project? Get some pics up of it.
if you have just bought the truck are you sure it deffo goes or did you buy it with flat batterys
give nev a ring at kemp commercials they should be able to help you they up nr bishop auckland
murphe5:
Hi Folks,
I recently purchased a 1996 143 500hp.
My mechanic accidentally crossed the jump start cables on the battery the other night.
The truck will not start since.
I have taken out the ECU and this looks to be fine.Anyone have any suggestions please?
Thanks,
Eddie
Where are you mate, in the north west?
If you are, the man you want to speak to a a bloke called Darren Koppack, he is a great spark, with extensive scania history, he does most of Deeside Truck Services Trouble shooting, which is my local Scania dealership.
PM me if you want his number.
try a bit of easy start then see if it runs we had a s reg scania tha wudnt start, turned over an over, changed ecu, relays checked fuses etc, give it a bit of easy start an it ran fine then,
or as sed b4 change a few a relays around check fuses,
let us no how it goes
Thanks Guys,
Checked relays and fuses last nite…
Didnt start either:(
It is actually a T cab 143, so yes it is a bit of a project:)
Will get a few pics up as soon as I can
I am based in Ireland.I have asked around, but the 500hp scanias are very rare here.
so dont think there is a chance of getting an ecu to test with this one…
Cheers,
Eddie
Just a thought…
Do the Scanias have glow plugs, if so are they working… Either that and go for broke and crank the bugger till the batteries are flat…
Just dont let the mechanic back to jump it…
going to change teh altenator today as it is completely fried…
just wondering could this be the problem?
Yes, easily and believe it or not that’s what I was going to suggest. But didn’t as I thought others would know the answer better than I.
To add, I remember when the alternator dies on those 3 series the ignition key used to lock in the on position, did you notice that happen at all. ? The you used to have to swap the two silver cased relays over, if they were the originals anyway.
Thanks, have new altenator on the way:)
The ignition key has not locked in the on position though…i can turn the key no problem…
Funny you should mention the alternator, the brushes went on my 4 series once, it wouldn’t start, called scania out, the mechanic used a piece of wire between 2 fuses in the fuse box and hey presto it fired up! Apparently there was a system that wouldn’t allow the engine to be turned over because the brushes led the management system to believe the engine was already running. I know this isn’t quite the same as yr problem, but it just goes to show how something so simple can be so easily fixed.
My previous Daf had the same set up as yours Rob, noticed 1 day the alternator light was flickering a bit then the truck wouldn’t turn over, i’d not long had a new starter fitted so was ready to roast my local Daf dealer!!! Got thee truck back from Kings Lynn without shutting it off, enquired at Daf they said check the alternator brushes as the two things are linked up, hey presto new brushes problem solved.