stuck Posted June 7, 2009 Share Posted June 7, 2009 Need some help gents, Although it's not finished I have had my truck running, been out to it today to do some more work and it wont start. Checked all voltages and have found that the ECU is not enabling the fuel pump (I have +12v on pin 37 not 0v) all other inputs / outputs appear to be correct, only other thing I can find is that battery voltage is down to 11.5v (plenty of juice to crank the engine though) Why is my fuel pump not being enabled? Cheers, Mick. Quote Link to comment Share on other sites More sharing options...
mad_pete Posted June 7, 2009 Share Posted June 7, 2009 Need some help gents,Although it's not finished I have had my truck running, been out to it today to do some more work and it wont start. Checked all voltages and have found that the ECU is not enabling the fuel pump (I have +12v on pin 37 not 0v) all other inputs / outputs appear to be correct, only other thing I can find is that battery voltage is down to 11.5v (plenty of juice to crank the engine though) Why is my fuel pump not being enabled? Cheers, Mick. is the fuel pump relay working ? Quote Link to comment Share on other sites More sharing options...
stuck Posted June 7, 2009 Share Posted June 7, 2009 is the fuel pump relay working ? No thats the problem, MS is not dropping pin 37 to 0v to enable the relay. Quote Link to comment Share on other sites More sharing options...
bobtail84 Posted June 7, 2009 Share Posted June 7, 2009 No thats the problem, MS is not dropping pin 37 to 0v to enable the relay. Pin 37 is an earth. When the ignition is 1st turned on pin 37 is active for about 5 seconds then it actvates when cranking and running. Try earthing the fuel pump relay, with the ignition on, to the chassis. The pump should come in. Jeff Quote Link to comment Share on other sites More sharing options...
stuck Posted June 7, 2009 Share Posted June 7, 2009 Thanks Jeff, If I earth the fuel pump relay the pump does run but still won't start so I'm guessing the ECU isn't happy about something. Wouldn't mind but I haven't touched anything since it last ran. Quote Link to comment Share on other sites More sharing options...
stuck Posted June 7, 2009 Share Posted June 7, 2009 FFS Don't know what happened there but I've just been back out and it started first time Ripped the Lucarse stuff out for this very reason! Cheers for the help though gents. Mick. Quote Link to comment Share on other sites More sharing options...
mad_pete Posted June 7, 2009 Share Posted June 7, 2009 FFS Don't know what happened there but I've just been back out and it started first time Ripped the Lucarse stuff out for this very reason! Cheers for the help though gents. Mick. I think MS needs to see the the fuel pump circuit go live before it will play. I think if you bypass MS and manually set the fuel pump on MS won;t play. Quote Link to comment Share on other sites More sharing options...
bobtail84 Posted June 7, 2009 Share Posted June 7, 2009 I think MS needs to see the the fuel pump circuit go live before it will play. I think if you bypass MS and manually set the fuel pump on MS won;t play. Also MS needs to see a signal from the VR sensor whilst cranking or it won't trigger the earth on pin 37. Jeff Quote Link to comment Share on other sites More sharing options...
bobtail84 Posted June 19, 2009 Share Posted June 19, 2009 I've had a little problem with a mates MegaSquirt. He was having constant resets and some times he had to earth the ECU on the chassis to make the fuel pump work. The ECU was not 1 of Fridge's it was from another source. A call to the MegaSquirt HFH help line suggested earth's so a couple of hours with the multi meter found no problem's. An E-mail to the maker of said ECU and he wanted it sent to him to test. 3 day's later the ECU returns with an E-mail to "check the earth's".... While we waited for the return of the ECU we plugged mine in on my mate's engine and hey presto no problem's so we MOTed his motor. The returned ECU was plugged back in and ran fine for about 10 min's.. then mass resets and 4 to 6 volt's through the case. I had a phone call from my mate on Saturday night and he was ready to put a dizzy back in After some soothing word's he said he would wait till I popped round in the morning. I checked all the voltages, earth's and resistance on the MS plug and the earth's AGAIN... then plugged my ECU in to his car and hey presto AGAIN the car ran like a dream. A call to my brother who live's just out side Montrose and the usual question's answered said send it to me and I will have a look. He build's MS ECU's and has a stim. Got an E-mail in the week saying.. ECU is getting hot and sometimes wont boot until you earth the case. D19 5volt zenner is getting very hot... He is going to change the D19 and let me know. So some times reset's might be something else but not very often.. I will keep yall informed. Jeff Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted June 19, 2009 Author Share Posted June 19, 2009 ^^^^ Cue Fridge for sensible comments Whilst I might be quite good at tuning, he's the king of those little leccy rattley bits in a bag D19 ? - Sounds like a class of mine from years ago Nige Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted June 19, 2009 Share Posted June 19, 2009 A very quick glance at the circuit diagram suggests if D19 is getting hot, U5 or D9 could be dodgy or D9 could be the wrong way round. Measure the voltage across D19, it should be no more than about 5.1V (by definition D19 will clamp the voltage to max. ~5.6v until it melts, its job is to protect everything else). If you don't have a meter with diode test you can remove D9 to prove it's not the problem. You can test the output of U5 by removing F1 and measuring the voltage coming out of U5 pin 3, again it should be near as damnit 5V. Quote Link to comment Share on other sites More sharing options...
bobtail84 Posted June 20, 2009 Share Posted June 20, 2009 Cheer's Fridge, I've sent my bro that info and will report back. Jeff Quote Link to comment Share on other sites More sharing options...
bobtail84 Posted July 1, 2009 Share Posted July 1, 2009 Erm............ We and I say we as feel somewhat responsible for kwak1261 entering the murky realm of MegaSquirt have cooked another ECU... Last Thursday kwak removed the ECU that Fridge had built for another job we have to start, whilst his original was being repaired by my brother, then replaced it on Monday morning and....... well he's broke it. It has track's from U5 down to D9. The D19 was kin hot so the general thought was that the loom it defective. kwak had the whole loom out and traced every wire used to run MegaSquirt, EDIS8 and there are no breaks or extra wires connected where there not supposed. The only thing that might have happened is that the Tach out wire my have shorted on the main relay.... any thoughts... I've replaced the 2nd ECU with the original that's been repaired and the motor run's fine but when as the temp rises to just over 75c the gauge in mega tune for temp jumps around between 78 and 87. The fan's are set to come on at 84.8 and out at 79.8 so at the moment the fan's come on and off randomly. My brother is going to have a look at the temp circuit and see what's wrong. Fridge, my brother was very impressed with the workmanship in the ECU you sent kwak. He said it's a 4kin lot better than that 1st 1 we sent him. I'm still trying to work out how or why we are cooking ECU's it's a puzzler. Jeff Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 2, 2009 Share Posted July 2, 2009 With the ignition on and the ECU disconnected, check what you're getting on all the pins of the connector - I suspect you're shoving 12v up a signal pin from somewhere or shorting something to ground (possibly TPS as that uses the 5v supply). It sounds like you may have cooked U5, not the end of the world but I wouldn't run it like that as it could damage the CPU, and that would be bad. Diagram of what you're setting fire to is here if it helps Quote Link to comment Share on other sites More sharing options...
bobtail84 Posted July 2, 2009 Share Posted July 2, 2009 Diagram of what you're setting fire to is here if it helps Thanks for that... Jeff Quote Link to comment Share on other sites More sharing options...
Steve 90 Posted July 3, 2009 Share Posted July 3, 2009 Anybody here running a 3.9 auto in a 90 with MS????? If so what sort of fuel consumption are you getting with road/high box driving and off road/low box driving? Also any chance I could have a try of whatever MSQ/MAP you are running? Cheers. Steve. Quote Link to comment Share on other sites More sharing options...
Boothy Posted July 3, 2009 Share Posted July 3, 2009 Steve, Steve, Steve, You should know better than to insult any V8 boys by asking a question like "what sort of fuel consumption are you getting ?", Its a terrible question toask when the TDi freaks are listening in, 28.2 GPM mine, oh GPM = Grins Per Mile, nuff said. Quote Link to comment Share on other sites More sharing options...
Steve 90 Posted July 3, 2009 Share Posted July 3, 2009 Steve, Steve, Steve,You should know better than to insult any V8 boys by asking a question like "what sort of fuel consumption are you getting ?", Its a terrible question toask when the TDi freaks are listening in, 28.2 GPM mine, oh GPM = Grins Per Mile, nuff said. LOL, But seriously, Mines worse than bad at the minute. Most people that ive spoken too have reasonable range so im sure its very possible. Unfortunately they are running other systems not MS so I cant pinch their MSQ's/MAP's to try. Mine actually runs pretty well, There's still room for improvement im sure but on the whole its pretty good power wise and pretty responsive (Way more responsive than any TD5 ive driven). My issue is I want to do some foreign long distance events and at the moment I'd never carry enough fuel. There are people that have done them on 100L of fuel in bigger V8's than mine. At the pressent rate I think I would have to carry about 250+L for the same event!!!!! Roughly how much do you use in a day Chris? Quote Link to comment Share on other sites More sharing options...
Boothy Posted July 3, 2009 Share Posted July 3, 2009 I have an Escort "Ralloy" alloy fuel tank that hold about 9 gallons. If I do a normal 6 hour challenge I will probally use somewhere in the region of 30 litres, and that's a lot of revving and showboating I suppose in there, the unessessary little revs and bips, if you know what I mean, the nice sounding ones that only a V8 can make, so I suppose I could use less, but if it was a speedier event then no doubt I would use an awfull lot more. Cheers Steve, good luck Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 4, 2009 Share Posted July 4, 2009 If it helps with comparisons, the worst I've managed on the road is 10mpg but that is ~5-6 tonnes all up (car & car on trailer & tonnes of gear in the back). What are your exhaust gas correction settings? Quote Link to comment Share on other sites More sharing options...
Steve 90 Posted July 4, 2009 Share Posted July 4, 2009 If it helps with comparisons, the worst I've managed on the road is 10mpg but that is ~5-6 tonnes all up (car & car on trailer & tonnes of gear in the back). I'd be happier with that as my worst fuel consumption, At the moment I'd be lucky to get that on the road and the truck weighs 1960kg's What are your exhaust gas correction settings? Good question what are "exhaust gas correction settings ????? I assume its something to do with the O2 sensor feedback and how much effect it has on the fueling???????? I'll have a look after work today and see if I can find anything that makes sense! Any pointers where I'll find them, what they should look like and what they are? Quote Link to comment Share on other sites More sharing options...
Steve 90 Posted July 4, 2009 Share Posted July 4, 2009 I have an Escort "Ralloy" alloy fuel tank that hold about 9 gallons.If I do a normal 6 hour challenge I will probally use somewhere in the region of 30 litres, and that's a lot of revving and showboating I suppose in there, the unessessary little revs and bips, if you know what I mean, the nice sounding ones that only a V8 can make, so I suppose I could use less, but if it was a speedier event then no doubt I would use an awfull lot more. Cheers Steve, good luck Mmmm, I think I'd struggle to do 6 hours on a 60ltr tank! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 4, 2009 Share Posted July 4, 2009 Quote Link to comment Share on other sites More sharing options...
powerspeeder Posted July 6, 2009 Share Posted July 6, 2009 Hi Guys i have been wading through for what seems like months (LOL) trying to get the last bits off me megasquirt conversion done but still could do with some small areas of help 1 can anyone help with the definitive answer for the 2 wire setup idle control valve 2 also anyone post a starting map for a 3.9 disco i know that the info should be out there in the posts but my eyes are blurred and someone might know of the top of there head heres hoping Quote Link to comment Share on other sites More sharing options...
evo828 Posted July 7, 2009 Share Posted July 7, 2009 Anybody here running a 3.9 auto in a 90 with MS????? If so what sort of fuel consumption are you getting with road/high box driving and off road/low box driving? Also any chance I could have a try of whatever MSQ/MAP you are running?Cheers. Steve. 3.9 with Auto box (Disco I) - 22 mpg on-road ; 9 mpg off road (approximatelly) Quote Link to comment Share on other sites More sharing options...
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