W251 R-Class EGR Issues

[ber5ien]

I have been made aware that some other people has got same issue and that only fix is or delete or replace it with Mercedes oem.
Any idea why my aftermarket does not work?
Is there a learning procedure after replacement or ecu coding needed?

 

[eurocar504]

Sorry connector not plugged in to the EGR. Should I check it with it plugged it and some probe on the back of the connector?

Connector disconnected values seem fine. 5V ref and 12V for EGR motor. But you need to check with connector connected to make sure that the ECU is not an issue.

I have been made aware that some other people has got same issue and that only fix is or delete or replace it with Mercedes oem.
Any idea why my aftermarket does not work?
Is there a learning procedure after replacement or ecu coding needed?

Lots of issue with the EGR are never resolved because the system is a bit complicated but you should be able to fix it.

Make sure the EGR cooler is not plugged by the way.
Also check your MAF and air filters.

 

[ber5ien]

Apparently the issue is also connected with using aftermarket EGR (new one) which i have tried.
Just hard that someone in my city has had same issue/same error codes try 3 different EGR and also was checking everything.
Fitted OEM from Mercedes and the problem got resolved.

I ordered another Wahler/Oem for my car so will update again once fitted next week.

Perhaps after market needs to extra adaption I only tried 3 cold starts (ignition on/off) apparently that should be enough for ECU to learn values.

 

[eurocar504]

Yes, completely possible that the aftermarket one is crap... Hopefully the OEM works!

 

[Mersovod]

In fact, the MAF sensor serves to calculate the flow of the EGR, therefore, in case of malfunctions in the system, you need to check the reliability of the MAF, the tightness of the exhaust system and intake system, the serviceability and cleanliness of the EGR valve itself and the absence of tuning kits or tuning the firmware of the CDI unit. There were also cases on OM642 when the inner shell of the corrugated pipe to the USR valve peeled off, because of this the gas flow decreased uncontrollably.

 

[eurocar504]

In fact, the MAF sensor serves to calculate the flow of the EGR, therefore, in case of malfunctions in the system, you need to check the reliability of the MAF, the tightness of the exhaust system and intake system, the serviceability and cleanliness of the EGR valve itself and the absence of tuning kits or tuning the firmware of the CDI unit. There were also cases on OM642 when the inner shell of the corrugated pipe to the USR valve peeled off, because of this the gas flow decreased uncontrollably.

Absolutely. That's why unfortunately a lot of people try deleting it instead of fixing it.

 

[Mersovod]

Probably the problem is the cost of restoration.

 

[ber5ien]

Another issue developed. It is not showing any values now?
Same with a new EGR. Funny enough it was all working the other day then next day after another test drive is gone.
Any idea still there is a voltage on oins
4.1v 5v and 12 v

 

[Mersovod]

Check the wiring and Z couplings Z13 and Z14.

 

[ber5ien]

Sorry, can't seen this clearly. Is it some kind joining point?