Parasitic current leakage

twilightflyer · Dec 10th, 2012, 19:01

found this on a site.any use? found it quite interesting.

http://www.youtube.com/watch?feature...&v=KF1gijj03_0

There is also a lot more videos on this guys site which may be of help

rexer12 · Dec 11th, 2012, 01:38

haven't seen this one but i used one like this when i tested for battery drain, its good to know though

KBB · Dec 11th, 2012, 11:12

No good when your car has CAN BUS. Removing and replacing fuses causes the various ECUs to power up and go through a boot up procedure and will create abnormal current draw until they go back in to sleep mode. This can take up to 40 minutes for each ECU that has had its fuse removed and replaced to return to sleep mode.

The method now is to use a inductive current clamp to establish total current draw and then measure voltage drop across fuses, the voltage drop is looked up against the fuse charts to establish which circuit has the excess draw, negating the need to remove fuses.

Remember the vehicle has to be locked and anti-theft activated to see what the exact level of current draw is taking place.

The method described is the way it was done before vehicles were fitted with more ECUs on a controler network.

twilightflyer · Dec 11th, 2012, 19:27

Quote:

Originally Posted by KBB

No good when your car has CAN BUS. Removing and replacing fuses causes the various ECUs to power up and go through a boot up procedure and will create abnormal current draw until they go back in to sleep mode. This can take up to 40 minutes for each ECU that has had its fuse removed and replaced to return to sleep mode.

The method now is to use a inductive current clamp to establish total current draw and then measure voltage drop across fuses, the voltage drop is looked up against the fuse charts to establish which circuit has the excess draw, negating the need to remove fuses.

Remember the vehicle has to be locked and anti-theft activated to see what the exact level of current draw is taking place.

The method described is the way it was done before vehicles were fitted with more ECUs on a controler network.

Glad you mentioned that 'cos I for one didn't know this, thanks for pointing this out.

KBB · Dec 11th, 2012, 22:08

http://www.bing.com/videos/search?q=...9CB6DD&first=0

And here is the very method I was refering to. Dealerships are issued with voltage charts that you look up you mv voltage drop and it tells you the current flow in that circuit.

Dec 10th, 2012, 19:01	#1
twilightflyer Senior Member Last Online: Jul 16th, 2023 11:37 Join Date: Sep 2008 Location: East Yorkshire	Parasitic current leakage found this on a site.any use? found it quite interesting. http://www.youtube.com/watch?feature...&v=KF1gijj03_0 There is also a lot more videos on this guys site which may be of help

Dec 11th, 2012, 01:38	#2
rexer12 Premier Member Last Online: Jun 20th, 2019 16:10 Join Date: Jan 2012 Location: doncaster	haven't seen this one but i used one like this when i tested for battery drain, its good to know though __________________ 2013 V40 D3 manual, standard

Dec 11th, 2012, 11:12	#3
KBB Master Tech Last Online: May 18th, 2020 10:57 Join Date: Dec 2006 Location: On Contract Dubai Automotve Technical Academy	No good when your car has CAN BUS. Removing and replacing fuses causes the various ECUs to power up and go through a boot up procedure and will create abnormal current draw until they go back in to sleep mode. This can take up to 40 minutes for each ECU that has had its fuse removed and replaced to return to sleep mode. The method now is to use a inductive current clamp to establish total current draw and then measure voltage drop across fuses, the voltage drop is looked up against the fuse charts to establish which circuit has the excess draw, negating the need to remove fuses. Remember the vehicle has to be locked and anti-theft activated to see what the exact level of current draw is taking place. The method described is the way it was done before vehicles were fitted with more ECUs on a controler network.

Dec 11th, 2012, 22:08	#5
KBB Master Tech Last Online: May 18th, 2020 10:57 Join Date: Dec 2006 Location: On Contract Dubai Automotve Technical Academy	http://www.bing.com/videos/search?q=...9CB6DD&first=0 And here is the very method I was refering to. Dealerships are issued with voltage charts that you look up you mv voltage drop and it tells you the current flow in that circuit.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)