Car not cranking

runswithscissors · 07-27-2010, 03:27 AM

Tonight I went to try to scan the computer and accidentally bridged E1 and B+. I have a bad feeling it blew out the ECU. Does anyone have any suggestions?

runswithscissors · 07-27-2010, 05:31 PM

nevermind it just blew the fuse

MANDALAY · 07-27-2010, 08:54 PM

Blowing a fuse is there only to protect the wire so as not to have a fire.
I sincerely hope you havent fried your ECU as no fuse is quick enought to protect any electrical components in a car

CJMR2T · 07-27-2010, 09:29 PM

A fues is to protect the circuit / the electrical component(s) within the circuit, not the wire. Pretty much all the wiring in a car will hand more current then what the circuit is protected to by the fuse. You select a fuse rating to protect the item and the wire is sized to carry more then that. Fuse location is often chosen to protect from fire.

It shouldn't have effect the ECU as it would be a short prior to the ECU. No load should have been placed through the ECU. Now it is was E2 and +B, thats a different story but since it was E1 (which is a direct ground), All the current would have traveled from the EFI fuse to ground thus blowing the fuse.

runswithscissors · 07-27-2010, 10:00 PM

Correct. I was able to restart the car after placing a new fuse in.

MANDALAY · 07-28-2010, 03:17 AM

Quote:

Originally Posted by CJMR2T

A fues is to protect the circuit / the electrical component(s) within the circuit, not the wire. Pretty much all the wiring in a car will hand more current then what the circuit is protected to by the fuse. You select a fuse rating to protect the item and the wire is sized to carry more then that. Fuse location is often chosen to protect from fire.

It shouldn't have effect the ECU as it would be a short prior to the ECU. No load should have been placed through the ECU. Now it is was E2 and +B, thats a different story but since it was E1 (which is a direct ground), All the current would have traveled from the EFI fuse to ground thus blowing the fuse.

Will agree with the second paragragh but not the first one unless the unit has reverse polarity protection

07-27-2010, 03:27 AM	#1 (permalink)
runswithscissors Beams Owners Group Join Date: Jun 2010 Posts: 32 Thanks: 1 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Car not cranking Tonight I went to try to scan the computer and accidentally bridged E1 and B+. I have a bad feeling it blew out the ECU. Does anyone have any suggestions?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

07-27-2010, 05:31 PM	#2 (permalink)
runswithscissors Beams Owners Group Join Date: Jun 2010 Posts: 32 Thanks: 1 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	nevermind it just blew the fuse

07-27-2010, 08:54 PM	#3 (permalink)
MANDALAY Beams Owners Group Join Date: Feb 2007 Location: victoria AUSTRALIA Posts: 4,210 Thanks: 136 Thanked 112 Times in 107 Posts My Google Map iTrader Rating: (6/100% )	Blowing a fuse is there only to protect the wire so as not to have a fire. I sincerely hope you havent fried your ECU as no fuse is quick enought to protect any electrical components in a car

07-27-2010, 09:29 PM	#4 (permalink)
CJMR2T Fabricator Join Date: Oct 2009 Location: Lakeland, FL Posts: 3,688 Thanks: 3 Thanked 356 Times in 337 Posts iTrader Rating: (4/100% )	A fues is to protect the circuit / the electrical component(s) within the circuit, not the wire. Pretty much all the wiring in a car will hand more current then what the circuit is protected to by the fuse. You select a fuse rating to protect the item and the wire is sized to carry more then that. Fuse location is often chosen to protect from fire. It shouldn't have effect the ECU as it would be a short prior to the ECU. No load should have been placed through the ECU. Now it is was E2 and +B, thats a different story but since it was E1 (which is a direct ground), All the current would have traveled from the EFI fuse to ground thus blowing the fuse.

07-27-2010, 10:00 PM	#5 (permalink)
runswithscissors Beams Owners Group Join Date: Jun 2010 Posts: 32 Thanks: 1 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Correct. I was able to restart the car after placing a new fuse in.