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oops 9093 mspnp ran car with ST fuse in, damage?

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oops 9093 mspnp ran car with ST fuse in, damage?

Old 06-17-2011, 01:17 AM
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Default oops 9093 mspnp ran car with ST fuse in, damage?

Ok long story short i made the huge mistake to let a friend borrow my ecu to see if his Fe3 itb miata ran, and it did.


in the mean time just to start the car for 2 mins to let oil circulate, i put the stock ECU in with a 20A fuse in place of the 10A fuse (cause i couldnt find a 10A fuse) and i let the car run for a second, and then i shut it off...

i then got my mspnp back and i plugged it into the car and started quickly... it started for a second than died, then i started it again... started for a second than died...

i realized i still had the 20a fuse in place so i ripped it out now the car isnt starting... pulled all my plugs and its firing on all cylinders (spark on each cylinder)

is it possible that i damaged my MSPNP in those 2 seconds?


thx for the help im getting nervous i have a race this weekend
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Old 06-17-2011, 08:34 AM
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you damaged the driver the powers the fuel pump.

you can bypass it by jumping fp and gnd in the diagnostics connector, but it's not ideal.
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Old 06-17-2011, 09:41 AM
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Originally Posted by Braineack View Post
you damaged the driver the powers the fuel pump.

you can bypass it by jumping fp and gnd in the diagnostics connector, but it's not ideal.
great, is it ok for me to race like that for a couple days? (my cars a n/a 1.6 btw)... then i geuss i have to send it to megasquirt to get it repaired ? any idea what that would cost?
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Old 06-17-2011, 10:08 AM
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its a simple transistor that gets replaced. I'm sure youll spend more on shipping than anything.


and yes it's okay, but if you crash your fuel pump will always be running.

Last edited by Braineack; 06-17-2011 at 11:19 AM.
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Old 06-17-2011, 11:00 AM
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Originally Posted by Braineack View Post
its a simple transistor that gets replaced. I'm sure youll spend more on shipping than anything.


and yes it's okay, but if you crash your fuel pump will always be running.
Awesome! thats always fun!!!! thank you for such a quick reply i appreciate the help.

Last edited by Braineack; 06-17-2011 at 11:19 AM.
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Old 06-17-2011, 11:28 AM
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The transistor is a ZTX553, and is located in the corner of the smaller board, near the tuning cable port. It is identified as Q5. The transistor is inexpensive and easy enough to replace if you have a soldering iron. You may be able to find one locally, or it can be ordered off our site:

http://www.diyautotune.com/catalog/t...3nd-p-243.html
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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 06-17-2011, 02:13 PM
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Originally Posted by Ben View Post
The transistor is a ZTX553, and is located in the corner of the smaller board, near the tuning cable port. It is identified as Q5. The transistor is inexpensive and easy enough to replace if you have a soldering iron. You may be able to find one locally, or it can be ordered off our site:

http://www.diyautotune.com/catalog/t...3nd-p-243.html
Thanks for the information, do you guys do the repair itself to? im not entirely to sure i trust anyone else with my megasquirt.

also will i harm the megasquirt by running the car with the grnd and fuelpump ports jumped? i cant see it damaging anything.
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Old 06-17-2011, 02:37 PM
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i geuss braineack sorta already answered that question, what a rookie mistake.
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Old 06-17-2011, 02:41 PM
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Originally Posted by miata39 View Post
Thanks for the information, do you guys do the repair itself to? im not entirely to sure i trust anyone else with my megasquirt.

also will i harm the megasquirt by running the car with the grnd and fuelpump ports jumped? i cant see it damaging anything.
We can fix it for $50 + return shipping, our minimum rate.

You won't harm the MegaSquirt by jumpering the fuel pump relay, but if you get in accident, a hard-wired fuel pump won't automatically shut off. So there is a safety risk there--the level of that risk is based on your judgement (I personally would not be comfortable).
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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 06-17-2011, 07:39 PM
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Originally Posted by Ben View Post
We can fix it for $50 + return shipping, our minimum rate.

You won't harm the MegaSquirt by jumpering the fuel pump relay, but if you get in accident, a hard-wired fuel pump won't automatically shut off. So there is a safety risk there--the level of that risk is based on your judgement (I personally would not be comfortable).
Neither am i, I just have commitments with sponsors that i cant turn down... Sponsorship makes racing stressfull some times. It should be ok!
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Old 06-17-2011, 08:11 PM
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You could put a string on the paper clip used to jumper the fp on and run it to the cabin. One yank and the fuel pump is off
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