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INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 5:56 am
by orford2004
I have megasquirt II V3.0 and the injectors don't light on the stim but the led light on megasquirt. If i check the pin#21 on the CPU, it flash but i got nothing on he pin#22. What could be wrong???
Re: INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 6:17 am
by Matt Cramer
First thing to do is check for settings problems. Can you post your MSQ?
Re: INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 8:26 am
by orford2004
Re: INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 9:12 am
by Matt Cramer
That should have the same behavior on both channels. Have you tried injector test mode?
Re: INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 2:51 pm
by orford2004
Yes Matt i just did but same thing. Flash on pin#21 but nothing on pin #22
Re: INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 2:53 pm
by orford2004
and it flash on pin#39 and 40
Re: INJECTOR NOT FIRING
Posted: Mon Apr 02, 2012 11:54 pm
by trakkies
orford2004 wrote:and it flash on pin#39 and 40
What do you get on the outputs of U4 (pin 5 & 7) ? If nothing, check there is 12 volts between pins 3 & 6.
Re: INJECTOR NOT FIRING
Posted: Tue Apr 03, 2012 2:59 pm
by orford2004
12V on pin 3 and 6 pin 3 is the neg.
pin #5 0.85V
pin #7 0.28V
Re: INJECTOR NOT FIRING
Posted: Tue Apr 03, 2012 11:18 pm
by trakkies
Have you looked at the V3 troubleshooting section in the manual? If pulses are present at the inputs to U4, but not the outputs and it has power, first double check it is the right way round. Also check D17 and D18 and Q14 and Q15 are also installed correctly - something wrong there might short the outputs from U4.
Is this a ready made or DIY assembled unit?
Re: INJECTOR NOT FIRING
Posted: Wed Apr 04, 2012 4:33 pm
by orford2004
What i don't understand is that the signal come from the CPU. It flash on pin #21 but not on pin #22. U4 flash on pin #2 but not on pin #4. What can happen for the pin #22 to not sending a signal????