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Old 01-04-2008, 12:28 AM   #1
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Default MegaSquirt Ignition Issues

I am not getting spark on coil pack 1.

When I boot the MS up, one LED turns on immediately and the other lags behind (D16), then they both get brighter because I have it set to ignition hold 1. I figure they are both supposed to light up at the same time.
The one that isn't firing eventually lights up, but it takes a second.


The D14 circuit contains R24, D14, R26, and Q6. It also takes an input from the processor, so technically the CPU is part of the processor too.

I swapped processors, tested both resistors, and replaced the transistor with same result.

Any suggestions?


http://www.megamanual.com/ms2/v3pcb_7.gif

Last edited by compy; 01-04-2008 at 01:59 PM.
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Old 01-04-2008, 12:29 AM   #2
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post a picture of your spark mod you performed.
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Old 01-04-2008, 12:34 AM   #3
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that was quick..

I know the inputs are correct (tach worked fine), so its something with the outputs...

I'm pretty sure the wires and resistors are correct.

Last edited by compy; 01-04-2008 at 12:49 AM.
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Old 01-04-2008, 12:47 AM   #4
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I was feeling ambitious. I never realized how hard it was to take pictures, so I took a lot. If you want any other angles or close ups, let me know.

Excuse the mess!













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Old 01-04-2008, 01:14 AM   #5
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What firmware are you using?
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Old 01-04-2008, 01:16 AM   #6
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029v or 029q
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Old 01-04-2008, 01:28 AM   #7
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I flashed it with 029v before i sent it back to him. It ran my car on one cylinder. I had no scope though so i couldn't check the outputs on the D14 circuit. So i tried my own processor in it. Swapped in a new transistor. Double checked everything on the bottom in terms of spark mods. It gets a good solid Tach reading without problems.

With a STIM connected both LEDs light equally as fast as each other without problems. With my coils disconnected both LEDs would light at exactly the same time. Switching my coils around, thinking that the coil itself might be the issue didn't change anything. D14 still lags behind D16.
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Old 01-04-2008, 11:57 AM   #8
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Quote:
Originally Posted by cjernigan View Post
It ran my car on one cylinder.
You mean two?
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Old 01-04-2008, 12:34 PM   #9
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maybe the 5v voltage regulator is bad. U5, IIRC


or the transistors are messed up, otherwise the circuit goes through a few resistors and the CPU itself. If Chad tried his CPU and it did the same, then that's ruled out.



or i guess U5 is good since the one fires.....maybe F1 or F2 is bad?
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Old 01-04-2008, 02:06 PM   #10
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Install and solder F1 and F2 {RXEF050-ND}. These are Amp poly fuses (small yellow discs that look similar to some capacitors) that acts like a circuit breaker on the 5 Volt supply to the PCB from the regulator. F1 installs very near the DB9, in the middle of some of the capacitors you have already installed. F2 installs near the center of the DB37 connector, and very close to it.

F1, F2 RXEF050-ND 0.48 Spares Polyswitch RXE Series 0.50A HOLD


They do not physically look like there is anything wrong with it. How do you go about testing one?
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Old 01-04-2008, 09:39 PM   #11
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good luck with answers Jason now that you went and got yourself banned. haha. i wish i had a ban stick in real life. does this mean i can ban you from borrowing my MS from Chad?
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Old 01-04-2008, 10:03 PM   #12
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umm.... he cant reply....hes banned.
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Old 01-04-2008, 10:59 PM   #13
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Quote:
Originally Posted by ArtieParty View Post
umm.... he cant reply....hes banned.
ain't it great?
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Old 01-05-2008, 02:31 PM   #14
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who said I was banned?

back to troubleshooting, I tested F1 and F2 with my ohm meter, and they both reported okay. Do they require more testing than that? Swap them?
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