MSPNP Launch control problem.
So, my launch control used to work. I had a switch between pins 12 and 13 so that i could turn it on and off. One day, it just stopped working. I removed my switch and just directly connected pins 12 and 13 on the center connector. Still no dice. So then, i email diy and they say to test the switch on the clutch pedal, the one farthest from the firewall. I pull the switch out and it has continuity when the clutch pedal is depressed and it does not have continuity when the pedal is not depressed. I assume this is how it is supposed to be. I would like to use the stock switch, however, if it came down to it, i suppose i could use a momentary pushbutton switch mounted on the steering wheel or something. Hmmm, im thinking maybe the left horn button?
Any ideas on what could be causing this? Thanks in advance, Wes |
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Oh, sorry i should post up my msq.
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Could you check the voltage on that wire loop on the center connector? It should be at battery voltage and drop to 0 when you put the pedal in.
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Yeah, i will be able to check that tonight. Thanks!
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The voltage on the loop between pins 12 and 13 is 13.7 volts all the time, clutch in or out. Think its a problem with my MS?
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Sorry, I should have said battery voltage rather than 5 volts and will fix my previous post. The Megasquirt is working, the clutch switch isn't.
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hmm, maybe it's the wiring, i checked the switch and it is good. I should be able to hook up a momentary switch between pin 12 and the ground and use that, correct?
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Yes.
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I've done that and still no dice. I hooked up a spst momentary pushbutton between pin 12 and a chassis ground and it did not work. I also just grounded pin 12 to see if i could get it to come on and still nothing.
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Does that drop the voltage to zero?
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If i hook the multimeter up with one lead on each side of the switch, it should show battery voltage until i press the button, then it should show 0. Is that correct? I will have to go check on it.
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Yes, that's correct.
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Originally Posted by Matt Cramer
(Post 270540)
Does that drop the voltage to zero?
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If you don't mind doing some tests with the cover off the MSPNP, check the voltage on pin 3 of the breakout header. Does the voltage go from 0 to 5 volts and back when you ground and unground the launch control input? Let me know what it's doing there.
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Originally Posted by Matt Cramer
(Post 272486)
If you don't mind doing some tests with the cover off the MSPNP, check the voltage on pin 3 of the breakout header. Does the voltage go from 0 to 5 volts and back when you ground and unground the launch control input? Let me know what it's doing there.
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Just 4 screws.
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