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Old 06-08-2008, 07:25 PM   #1
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Default 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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Old 06-08-2008, 08:17 PM   #2
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Oh, sorry i should post up my msq.
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File Type: zip msq.zip (5.7 KB, 48 views)
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Old 06-09-2008, 10:22 AM   #3
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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.

Last edited by Matt Cramer; 06-12-2008 at 08:56 AM. Reason: Fixed a voltage reading
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Old 06-09-2008, 10:43 AM   #4
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Yeah, i will be able to check that tonight. Thanks!
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Old 06-11-2008, 10:20 PM   #5
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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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Old 06-12-2008, 08:55 AM   #6
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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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Old 06-12-2008, 10:46 AM   #7
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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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Old 06-12-2008, 11:09 AM   #8
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Yes.
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Old 06-12-2008, 11:43 AM   #9
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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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Old 06-12-2008, 05:30 PM   #10
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Does that drop the voltage to zero?
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Old 06-12-2008, 05:35 PM   #11
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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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Old 06-13-2008, 09:02 AM   #12
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Yes, that's correct.
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Old 06-17-2008, 12:22 PM   #13
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Quote:
Originally Posted by Matt Cramer View Post
Does that drop the voltage to zero?
Well, i finally got a chance to mess with it again. The voltage does drop to zero, so i know that my momentary is good. Any other suggestions?
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Old 06-17-2008, 03:19 PM   #14
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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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Old 06-17-2008, 03:22 PM   #15
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Quote:
Originally Posted by Matt Cramer View Post
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.
I will see what i can come up with, is it pretty straight forward to take the cover off?
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Old 06-17-2008, 03:45 PM   #16
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Just 4 screws.
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