Injectors stopped firing

fige · 03-09-2010, 03:04 PM

So I went (drove) to the movies last night, came back. Car would not start.

I diagnosed the problem down to the board, (i manually grounded out injectors and they work).
Neither injectors bank 1 or 2 work.
Nothing looks burnt or melted.
What could be the reason for the malfunction? What was most likely melted?
Any help is appreciated. Thanks

domox · 03-09-2010, 07:17 PM

Version?

Injector driver IC might be bad.

burstcurse · 03-09-2010, 07:22 PM

man that sucks why'd it burn out did the relay stick on and leave power to the injectors while the car was off?

I screwed up a mschip once when i made an adapter harness that worked fine but shorted out and blew the pins that run the injector drivers. the board was fine but the chip fried. I tried to reburn the code and flash my msq back in but it would not spray any fuel till i got a new chip.

mabey the 2 injector drivers on the heatsink fried? they are direcly connected to the ground plane in the ms box and to the power coming from the injectors.

mabey your ms isnt grounded good. there are 2 ground planes in the v3.0 boards. one for 5v ground and another for 12v ground

fige · 03-09-2010, 07:41 PM

v2.2

Both drivers frying at once?
I've been driving the car without issues for a month now. till this happened.
and I can't find my voltmeter either. gawd

domox · 03-09-2010, 08:06 PM

No, not the transistors, the actual driver. Check this thread out. It's the opposite of what's going on with yours, but the same chip. Oh, and can you actually connect to the MS with a tuning laptop?

fige · 03-09-2010, 08:23 PM

yes I can connect MS to a tuning laptop.

I saw that thread. so it's possible to have the opposite effect. Ill see if I can swap it.

gross polluter · 03-09-2010, 08:25 PM

Does it show RPM and injector pulse width when you're cranking?

fige · 03-09-2010, 11:14 PM

It does show RPM. Can't remember if it shows injector pulse

gross polluter · 03-10-2010, 04:59 AM

If it shows RPM then it should show injector pulsewidth. Either way, start from the source of the signal and work your way through the circuit. It's more than likely the FET driver as suggested by others, but make sure everything else is working first.

linuxman51 · 03-10-2010, 10:42 AM

yeah, probably the IC. v2.2s are more susceptible to flyback failures and things of that nature. This is why I socket all of the IC's that do anything (well, not the rs-232 chip, they almost never die), makes life oh so easy. $4, pop out pop in, done.

If you lost a ground or have flaky grounds/battery terminals, you can really blow through some components pretty quickly. Just ask Rob.

fige · 03-10-2010, 10:43 PM

Can someone give me a recommendation where to get them?

thx

(digikey?)

fige · 03-10-2010, 11:35 PM

kyle figured it out.

The tps fell off in the full throttle position... fixed

thanks!

1_bar_of_boost · 03-10-2010, 11:45 PM

Quote:

Originally Posted by fige

kyle figured it out.

The tps fell off in the full throttle position... fixed

thanks!

i told you it was worth the 30 degrees outside

gross polluter · 03-11-2010, 03:57 AM

Quote:

Originally Posted by fige

kyle figured it out.

The tps fell off in the full throttle position... fixed

thanks!

This is why I told you to look at injector PW while cranking. This happens more often than you'd think and the ECU gets stuck in flood clear mode.

linuxman51 · 03-11-2010, 09:28 AM

Quote:

Originally Posted by gross polluter

This is why I told you to look at injector PW while cranking. This happens more often than you'd think and the ECU gets stuck in flood clear mode.

huh.. i've never had that happen, but i'll keep it in mind from now on.

gross polluter · 03-11-2010, 12:42 PM

Quote:

Originally Posted by linuxman51

huh.. i've never had that happen, but i'll keep it in mind from now on.

There's a lot of things that I've seen happen in other peoples' installs that can bring the TPS value high enough during cranking to enable flood clear. It's one of those settings that a lot of people overlook during assembly and don't think about when diagnosing a problem.

Lord_Athlon · 03-11-2010, 01:18 PM

Hilarious.

03-09-2010, 07:17 PM	#2
domox Board Member Join Date: Feb 2003 Location: Tucson, AZ	Version? Injector driver IC might be bad. __________________ domox About my car --> 78 262C Bertone Flat-hood Real Volvos are *built, not bought... B230FT \| MSnE w/ Boost Control-eFan-IAC-H20 Inj \| EDIS \| 4 Bar FPR \| Brown Tops .60/.63 T3 \| 3" exhaust \| 4" Intercooler ipd sways \| Bilsteins \| Lesjofors springs \| Tethys ------------------------ 82 240 TIC R.I.P.*

03-09-2010, 08:25 PM	#7
gross polluter They see me trollin' Join Date: Dec 2008 Location: San Diego, CA	Does it show RPM and injector pulse width when you're cranking? __________________ '88 245 - 2JZGTE VVTi \| MS3X ECU, MS2 TCU \| GT3582R-HTA \| Staged simultaneous dual fuel \| 590whp 580ftlbs @ 22psi

03-10-2010, 10:42 AM	#10
linuxman51 ARRRRHARHAR Join Date: Dec 2002 Location: mont, AL	yeah, probably the IC. v2.2s are more susceptible to flyback failures and things of that nature. This is why I socket all of the IC's that do anything (well, not the rs-232 chip, they almost never die), makes life oh so easy. $4, pop out pop in, done. If you lost a ground or have flaky grounds/battery terminals, you can really blow through some components pretty quickly. Just ask Rob. __________________ "They bum rushed them in their own crib, they drank all their beer, they partied with their ladies and they left with the trophy" Megasquirt Tuning! Plug and play LH 2.4 Megasquirt, now with stealth mode! ported volvo heads

03-10-2010, 10:43 PM	#11
fige ))<>(( forever. Join Date: Dec 2004 Location: A ****hole called Phoenix	Can someone give me a recommendation where to get them? thx (digikey?) Last edited by fige; 03-10-2010 at 11:07 PM..

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03-09-2010, 07:22 PM	#3
burstcurse Board Member Join Date: Aug 2005	man that sucks why'd it burn out did the relay stick on and leave power to the injectors while the car was off? I screwed up a mschip once when i made an adapter harness that worked fine but shorted out and blew the pins that run the injector drivers. the board was fine but the chip fried. I tried to reburn the code and flash my msq back in but it would not spray any fuel till i got a new chip. mabey the 2 injector drivers on the heatsink fried? they are direcly connected to the ground plane in the ms box and to the power coming from the injectors. mabey your ms isnt grounded good. there are 2 ground planes in the v3.0 boards. one for 5v ground and another for 12v ground

03-09-2010, 07:41 PM	#4
fige ))<>(( forever. Join Date: Dec 2004 Location: A ****hole called Phoenix	v2.2 Both drivers frying at once? I've been driving the car without issues for a month now. till this happened. and I can't find my voltmeter either. gawd

03-09-2010, 08:06 PM	#5
domox Board Member Join Date: Feb 2003 Location: Tucson, AZ	No, not the transistors, the actual driver. Check this thread out. It's the opposite of what's going on with yours, but the same chip. Oh, and can you actually connect to the MS with a tuning laptop?

03-09-2010, 08:23 PM	#6
fige ))<>(( forever. Join Date: Dec 2004 Location: A ****hole called Phoenix	yes I can connect MS to a tuning laptop. I saw that thread. so it's possible to have the opposite effect. Ill see if I can swap it.

03-09-2010, 11:14 PM	#8
fige ))<>(( forever. Join Date: Dec 2004 Location: A ****hole called Phoenix	It does show RPM. Can't remember if it shows injector pulse

03-10-2010, 04:59 AM	#9
gross polluter They see me trollin' Join Date: Dec 2008 Location: San Diego, CA	If it shows RPM then it should show injector pulsewidth. Either way, start from the source of the signal and work your way through the circuit. It's more than likely the FET driver as suggested by others, but make sure everything else is working first.

03-10-2010, 11:35 PM	#12
fige ))<>(( forever. Join Date: Dec 2004 Location: A ****hole called Phoenix	kyle figured it out. The tps fell off in the full throttle position... fixed thanks!