Specific Secondary air pump circuit questions
01-15-2011, 12:57 PM
#1
Member
Thread Starter
Join Date: Mar 2007
Location: PHX & Huntsville
Posts: 214
Likes: 0
Received 1 Like
on
1 Post
2010 Silverado, 03 H2, 66 Nova SS, 03 E55
Specific Secondary air pump circuit questions
I've got some pretty specific questions RE: The secondary air pump circuit. I'm hoping to get a little tribal knowledge from someone who has been there done that on a 2003 E55.
I have already jumpered my pump off of a battery and it works great, sounds like my daughter's hair dryer.
But, at no point am I getting current to the pump. So....
A) When is this circuit energized? (After start-up-if so how long, Only under certain climate conditions, etc, etc..)
B) Specific to 03 E55 where can I find any/all relays in the circuit?
c) Specific to 03 E55 where can I find any fuses or fu-links in the circuit?
Any knowledge passed on is endlessly appreciated.
I have already jumpered my pump off of a battery and it works great, sounds like my daughter's hair dryer.
But, at no point am I getting current to the pump. So....
A) When is this circuit energized? (After start-up-if so how long, Only under certain climate conditions, etc, etc..)
B) Specific to 03 E55 where can I find any/all relays in the circuit?
c) Specific to 03 E55 where can I find any fuses or fu-links in the circuit?
Any knowledge passed on is endlessly appreciated.
01-17-2011, 05:49 PM
#3
MBWorld Fanatic!
AFAIK its on cold start-up only to get cats to operating temps asap... how long they run for I cannot say, but not for very long - mbe 5 mins? Dont know the circuits related sorry... 
01-17-2011, 08:42 PM
#5
Newbie
Join Date: Jan 2011
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
2004 E55 and 2008 ML350
The pump will initially run on a cold start-up and then randomly while driving because the ME-SFI is testing the system (emissions). I think on a 2003 the relay is in the right side of the trunk behind the trim panel. The large 40 amp fuse should be in the right front fuse box under the hood. I may be confusing that with another vehicle, hope this helps.
