Page 1 of 1
Fuel pump doesn't stop running after 2s
Posted: Tue Dec 01, 2009 5:17 am
by Fairlane
Hello!
Fuel pump runs all the time if power is on in ECU. I have wired fuel pump to relay bord and it gives me 12v, even I don't start the engine. So it means that megasquirt keeps grounding the relaybord fuelpump relay, even if it should stop it if I don't crank the engine in 2s. Where's the problem, any ideas?
Thanks!
Re: Fuel pump doesn't stop running after 2s
Posted: Tue Dec 01, 2009 7:30 am
by dc
When you test MS on the stim does the fuel pump turn off in 2 seconds
Re: Fuel pump doesn't stop running after 2s
Posted: Sun Jan 24, 2010 10:40 pm
by Fairlane
Can you tell me where I could see, if the fuel pump is running with stim? I didn't find any indicator light from MegaTune.
Re: Fuel pump doesn't stop running after 2s
Posted: Mon Jan 25, 2010 7:15 am
by dc
Mega tune does not have a indicator but a Stimulator such as this does (PMP led) and it allows you to test your Megasquirt for problems and minor testing of your setup . DIY Auto Tune has it, I highly recommend these for any build this falls right next to having a timing light a volt meter
Re: Fuel pump doesn't stop running after 2s
Posted: Mon Feb 08, 2010 3:12 am
by Fairlane
Hello!
I tested Mega with stim and PMP LED is on all the time. So it seems that the problem is at the board. Any ideas, where I should start to search the problem?
Re: Fuel pump doesn't stop running after 2s
Posted: Mon Feb 08, 2010 8:11 am
by Matt Cramer
Yes, let me know what board version you have and I'll go over what to check.
Re: Fuel pump doesn't stop running after 2s
Posted: Mon Feb 08, 2010 8:34 am
by Fairlane
Mega 2 PCB3.0
Re: Fuel pump doesn't stop running after 2s
Posted: Mon Feb 08, 2010 10:45 am
by Matt Cramer
Here's the circuit to check:
Make sure Q2 isn't fried and D4 has not become shorted to ground.
Re: Fuel pump doesn't stop running after 2s
Posted: Thu Feb 11, 2010 7:16 am
by Fairlane
Thanks! I found that one trnsistor was short circuited, and it's works now.