|
|
|
|
|
#1
11-16-2005, 12:10 AM
|
|||
|
|||
|
secondary air injection system trouble
I have a 98 SL500. Ocasionally the check engine light comes on. I have a code reader and the error mesage is "secondary air injection system malfunction". I can reset it and it will be fine for a while. Have not noticed any pattern of when it comes on, maybe at idle when humidity is high. I've heard this can be very expensive and hard to solve. Anyone know of a good system check to isolate problem.
|
|
#2
11-16-2005, 08:23 AM
|
|||
|
|||
MANY scanners have the ability to activate that emission system(and most other systems as well). You need to do that in order to diagnose the problem.
When the air pump runs the FRONT O2 sensors must react to the oxygen from the pump & stop cycling. They MUST stay at 50mv or less durning that test!
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
|
|
#3
11-19-2005, 11:51 PM
|
|||
|
|||
|
check out this thread
http://www.peachparts.com/shopforum/tech-help/135607-w-124-air-pump-failing.html#post1019089
|
|
#4
11-20-2005, 05:42 AM
|
|||
|
|||
|
Quote:
That thread is for the old belt drive pumps. Your chassis has an electric pump http://catalog.eautopartscatalog.com/mercedesshop/sophio/image.jsp?title=Air%20Pump&url=http%3A//img.eautopartscatalog.com/live/B601070965BOS.JPG Check if it comes on and check fuse power.
|
|
#5
11-20-2005, 09:39 AM
|
||||
|
||||
|
if the air pump works
possibly clogged/not opening air valves or egr ports in the head. I just fought an E320 with the same problem. It would turn the light on after 100 miles or so. pay close attention to the o2 voltages
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
|
|
#6
11-20-2005, 10:08 AM
|
|||
|
|||
|
One thing to check is the vacuum line from the switch to the bypass valve. I had that occur on my SL and that is what it turned out to be. Check out our website at www.mbca.org/northtexas, go to tech stuff, then engine technical, there is location of engine controls. Fully inspect the vacuum lines to the bypass valve, the switch, and even check the valve to see if it is operating. Get this fixed as if it is broken you could ruin your air pump, or even worse ruin the converters. Good luck!
Brian
__________________
Brian W. Heitman www.MBCA.org/northtexas Join MBCA!!!
|
 |
| Bookmarks |
|
|
Linear Mode
