Injectors stuck on. Components changed Page 3 new results

Ask questions about DIY board assembly issues, fault finding and testing. (Covers all Megasquirt versions and board.)

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cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

Hi Luke and Matt, just desoldered the Fet driver and resoldered Q1 and Q5, voltage on cpu pins 21 and 22 goes up to 5.3v.
I guess I have a bad U4 driver right?
Matt Cramer
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Re: Totally lost, No injection, Test results added!

Post by Matt Cramer »

Sounds like it.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
slow_hemi6
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Re: Totally lost, No injection, Test results added!

Post by slow_hemi6 »

I always install a socket for the I.C's. I use the flashed type not the el cheapo's. Two reasons for this, Easy removal for testing and it keeps the soldering heat out of them.
Find the Manuals up top under Quick links: Manuals. :RTFM:
Cheers Luke
DaveEFI
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Re: Totally lost, No injection, Test results added!

Post by DaveEFI »

slow_hemi6 wrote:I always install a socket for the I.C's. I use the flashed type not the el cheapo's. Two reasons for this, Easy removal for testing and it keeps the soldering heat out of them.
All the ICs I've seen are designed to cope with the heat of soldering?
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racingmini_mtl
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Re: Totally lost, No injection, Test results added!

Post by racingmini_mtl »

DaveEFI wrote:
slow_hemi6 wrote:I always install a socket for the I.C's. I use the flashed type not the el cheapo's. Two reasons for this, Easy removal for testing and it keeps the soldering heat out of them.
All the ICs I've seen are designed to cope with the heat of soldering?
You can definitely kill a chip when soldering it. It usually happens if you apply heat for too long and on the pin instead of the pad.

Jean
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DaveEFI
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Re: Totally lost, No injection, Test results added!

Post by DaveEFI »

racingmini_mtl wrote:
DaveEFI wrote:
slow_hemi6 wrote:I always install a socket for the I.C's. I use the flashed type not the el cheapo's. Two reasons for this, Easy removal for testing and it keeps the soldering heat out of them.
All the ICs I've seen are designed to cope with the heat of soldering?
You can definitely kill a chip when soldering it. It usually happens if you apply heat for too long and on the pin instead of the pad.

Jean
That can apply to transistors too. But it's a long time since I've seen those in sockets. :D
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racingmini_mtl
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Re: Totally lost, No injection, Test results added!

Post by racingmini_mtl »

DaveEFI wrote:
racingmini_mtl wrote:You can definitely kill a chip when soldering it. It usually happens if you apply heat for too long and on the pin instead of the pad.

Jean
That can apply to transistors too. But it's a long time since I've seen those in sockets. :D
Of course. But the TO-220 package can usually handle much more heat than most chip and I've seen more than a few burned TO-92 packaged transistors (PN2222A and 2N3904). My point was mainly that soldering heat can be an issue.

Jean
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slow_hemi6
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Re: Totally lost, No injection, Test results added!

Post by slow_hemi6 »

Try to keep in mind that for some brave souls the MS could be their first crack at soldering anything. Their soldering iron could be borrowed from their neighbors wood burning kit. :lol:
I have been building MS boards since the v2.2 days and the fet drivers were far from bullet proof back then especially without a flyback board installed.
Sure you don't see transistors in sockets but you sure do see the processors in them, so for me the fet driver also goes in a socket mostly because I am a creature of habit but also because I know what I have benefited from in the past. Reliability? well my first v2.2 is still in a driven car and still on it's original socketed fet driver.
Find the Manuals up top under Quick links: Manuals. :RTFM:
Cheers Luke
cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

so going to replace few bits, can anyone recommend any replacements from this website:

http://www.conrad-electronic.co.uk/ce/en/Welcome.html

F1, F2:
MOV1:
Q1, Q5
U4:
slow_hemi6
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Re: Totally lost, No injection, Test results added!

Post by slow_hemi6 »

http://www.conrad-electronic.co.uk/ce/e ... archDetail

http://www.conrad-electronic.co.uk/ce/e ... archDetail

as for the mov this is as close as I can find. 17VRMS 22VDC 2KA.
http://www.conrad-electronic.co.uk/ce/e ... view1&rb=1

There are quite a few PTC fuses on there but I can't find one that I would use, in a smallish case.
cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

Hi Luke,
Are these replacements safe? Or would this be upgraded parts? The reason I ask is because this may become my daily driver.
slow_hemi6
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Re: Totally lost, No injection, Test results added!

Post by slow_hemi6 »

The first listed U4 is the part shown on the schematics, You should be ok there. The second Q1 and Q5 are the big sister part of the parts used in the standard MS they just switch more amps if required. As I said the MOV that is on the schematics is a 20V 3ka part and the closest I could find was 22v 2ka. The Ka is ample and the extra 2v I would not see as a deal breaker given the transients these are meant to stop are usually quite a bit higher than that. Spikes lower than that the power supply's input filter should have no problem dealing with. I could not find a PTC that I was happy with as a good replacement for the standard part.
Find the Manuals up top under Quick links: Manuals. :RTFM:
Cheers Luke
cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

Thanks again Luke i have just ordered all the bits needed, do the LEDs on board have to be 2v or can i gt the 3v Clear type?
slow_hemi6
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Re: Totally lost, No injection, Test results added!

Post by slow_hemi6 »

Generally it would be fine but you need to know the IF(mA) typical and max of the led to make any more comment.
Find the Manuals up top under Quick links: Manuals. :RTFM:
Cheers Luke
cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

We have partial life, I now have injection but for some reason I have very little spark.
I changed my LEDs to these:
http://www.conrad-electronic.co.uk/ce/e ... AREA_17640
But they don't light up when the MS is powered on or trying to fire up.

Any suggestion is helpful
cwdodson88
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Re: Totally lost, No injection, Test results added!

Post by cwdodson88 »

Have you tried flipping the polarity? that seems to be almost the same voltage, and amperage of the regular ones. Only Idea I have is that they have the anode/cathode length flipped. (Ive seen plenty of that from the ones I get off Ebay)
cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

So just want and done a quick startup log, have no RPM.

Tacho is wired on the DB37 pin 6 to JS1
cypriot_boy_2k7
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Re: Totally lost, No injection, Test results added!

Post by cypriot_boy_2k7 »

Ok reflashed the firmware, started to get rpm signal. Tryed to start but then died again. Now everytime MS connects to TS it comes up with the dialogue box settings are different from controller. Is this the CPU finished? Are there any test? I can do with the symptoms I've provided? I have a log which I will post when I'm with my laptop.


LOG ADDED
cypriot_boy_2k7
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Re: Injection working but no fire, Test results added! again

Post by cypriot_boy_2k7 »

Bump
billr
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Re: Injection working but no fire, Test results added! again

Post by billr »

I would like to see the tune (.msq) file that goes with the run log. First, though, let's talk about the "different settings" message when you try to connect to TS. At that point, you have to choose between the TS settings, or what is already loaded into the MS ECU. I suggest you open TS and save those settings as a file in a secure place, like a USB drive that you can physically remove from the computer; no chance of over-writing it. Then connect TS to the ECU and accept the "controller settings" and post those. When you post .msq, it might help posting the old saved TS file, as well as the current ECU file, if that won't confuse you too much.
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