OBD II drive cycle to reset monitor flags - Page 2 - PeachParts Mercedes-Benz Forum

97 SL320 · #16 03-06-2016, 04:51 PM

Not near SD.

Make sure the air pump is working and the solenoid valve / vacuum lines are intact.

This car will either have a belt driven air pump ( with a clutch like a AC compressor ) or a fully electric pump. Either of these will be mounted below the alternator.

clarkz712 · #17 03-10-2016, 05:11 PM

get cat really hot then let idle for 20 minutes that should let it test catalist
seconday air is the hard one. start cold engine run at 1400 rpm for 7 minutes after eng tem has past 70 deg then let idle for 6 seconds then turn ignition off for 10 seconds then repeat
after the 7 minute high rpm when you return to idle you should hear the pump turn on
good luck

Stevester 500E · #18 04-17-2016, 12:16 AM

I ran it for 1400 rpm for 7 minutes after engine temp reached 70, then returned to idle. The pump turned on for a few seconds and then stopped.
I then repeated the 1400 rpm, returned to idle but this time it didn't turn on.

The next day I did the same thing, the pump turned on the first time but not the second time.

Is it necessary for the pump to turn on the second time I run at 1400 rpm, and return to idle?

Quote:

Originally Posted by clarkz712

get cat really hot then let idle for 20 minutes that should let it test catalist
seconday air is the hard one. start cold engine run at 1400 rpm for 7 minutes after eng tem has past 70 deg then let idle for 6 seconds then turn ignition off for 10 seconds then repeat
after the 7 minute high rpm when you return to idle you should hear the pump turn on
good luck

97 SL320 · #19 04-17-2016, 08:34 AM

See my post 14, the after warm / back to idle air pump operation is to confirm it is working. Only done once per drive cycle.

erictemecula · #20 03-31-2017, 11:38 PM

Quote:

Originally Posted by carson356

if you are going to the dealer, ask them to Reset the DM, i have had a few 1996 and newer models that no matter how much we drove them the readiness would not pass until we reset the dm. when using the factory tool there is a rest option. i am not reffering to rest the codes, but a unit reset, hopefully they will see what i am talking about in the selection menu under the dm control module. after the reset you will still need to do the drive cycle, but it should go much easier. are you near san diego?

What does dm stand for? Only the MB dealer can reset it?
By the way, I am close to San Diego.