Cxha problem after change egr
- Thread starter Ra102
- Start date
-
- Tags
- cxha engine egr cooler
Thanks But What can do this codes when you have replace Egr?
Was the EGR cooler replacement done by a garage or was it DiY?
Is there an adaption value that needs to be reset with an egr cooler change like with a DPF clean/ renewal?
You may need VCDS over a commercial OBD reader to get into it.
You may need VCDS over a commercial OBD reader to get into it.
Excuse my Swedish but I think the circled metric refers to EGR valve position - in VCDS / English the same would be called "IDE07757 Exhaust recirculation valve 1 bank 1: position feedback - Actual value".
It's normal to see negative values in this one. As far as I've been able to figure out the negative value means the exhaust is run through the cooler and not bypassed. The below graph is from CXEB engine (the cooler might be slightly different) but you can clearly see the EGR output temperature going down when valve position is negative.
Well, the repair manual does not mention anything about needing to perform any diagnostics after changing the EGR assembly. Also very little information regarding more recent vehicles in the net - some mentions of the basic settings though.
I think the flow faults could come from
a) EGR valve not closing completely when it should, which would point to adaptation
b) Leak of some kind in the air intake system
c) MAF sensor issues
I was proposing to check the MAF and wiring first as it's easily reachable, within imagination that could have been disturbed during EGR work and known to be one of sources of these faults. The other alternatives are more difficult and might require for example air system pressure testing.
Again this is for CXEB so might be slightly different and not sure what can be seen from Autel.
Anyway, in one long drive IDE04468 Air mass at meter 1, which I think is MAF, had about 50 kg/h cold idling, 40 kg/h warm idling and 20-650 kg/h over the entire drive.
