Y85 exhaust Gas Recirculation Cooler Bypass Switch Over. Fault Code 53336/6058

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classiccarzone

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Joined
Aug 1, 2012
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385
Location
Ireland
Car
S203 CDI estate; S204 Cdi Estate,CL 203 X 2; Daimler V8 250 X3
The temperature gauge in my S220 Cdi 2.2 OM651 started to have difficulty reaching normal working temperature; often now moving from 60c, especially if the heater is switched on.

I also noticed that the ECO light goes Orange when the heater is switched on, but stays green with the heater off even when there is no difference in the temperature.

I am assuming that it is the thermostat.

However I put the Icarsoft scanner on it and I also noticed that there is a fault code 53336/6058.

Y85 Exhaust Gas Recirculation Cooler Bypass Switch Over.

I noticed this fault number a couple of months ago but forgot completely about it as it does not seem to be causing any noticeable problems.

From the attachment below (PAGE 32 and 33) I assume that this is actuated by vacuum.

However, if the temperature of the incoming exhaust gas is too low, the path to the EGR cooler is closed via a bypass flap and the exhaust gas is guided directly to the charge air manifold. The switchover valve for the bypass flap is controlled by a vacuum unit.


http://autocats.ws/manual/sdmedia/mediadb/mb_Acrobat/einf/204/einf_br204_cdi_OM651__en.pdf


Anybody experience this?

 
What is an S220? It's not a W220 as the S-Class never had a 4-Cylinder Diesel.

Do you mean a W212 (Saloon) S212 (Estate) E220?
 
Sounds like a weak thermostat, which is common.
 
However I put the Icarsoft scanner on it and I also noticed that there is a fault code 53336/6058.

I have had that fault code for over 2 years on my W204 C220 . I haven't really done much to resolve it as I suspect that a) it isn't easy to resolve and b) it doesn't seem to be impacting performance in any way.
It doesn't seem to be impacting how my car gets up to temperature.

As you suspect, I would think that you have a thermostat issue and it isn't related to the fault code you are seeing.
 
What is an S220? It's not a W220 as the S-Class never had a 4-Cylinder Diesel.

Do you mean a W212 (Saloon) S212 (Estate) E220?

Sorry a typo assisted by predictive text.
It is a C220 cdi. with a T for estate buy the OM651 is the definitive.

I am pretty sure that it is the thermostat given they are prone to failure.

I have not looked into this in any great detail as it is my first time experiencing a possible thermostat failure on these engines... however the water pump on these is assisted by vacuum but, without looking into it in any detail, this may only disconnect the water pump for a max of 500s on start up.
 
I have had that fault code for over 2 years on my W204 C220 . I haven't really done much to resolve it as I suspect that a) it isn't easy to resolve and b) it doesn't seem to be impacting performance in any way.
It doesn't seem to be impacting how my car gets up to temperature.

As you suspect, I would think that you have a thermostat issue and it isn't related to the fault code you are seeing.

Thanks for the response. I am pretty confident that the fault codes are not connected to the underheating but I did find them and now that I am getting my hands dirty I will fix everything.

It does not seem to be affecting my cars performance in any way but....from a brief reading it may suggest that this actuator, Y85, may assist at times in reducing soot going to the exhaust. If that is so it is good for the DPF.

Having said that my DPF is very healthy, zero ash and zero soot on a 200 mile passive cycle.

Just wondering if anybody else has experience of this fault (Y85) and the causes for it; Electrical or vacuum and whether it is more beneficial to repair it or leave it alone.
 
I have the exact same error, although I am having other issues that I believe are related.

I’m seeing boost pressure problems, and having checked everything I can myself (intercooler pipes etc) I’m beginning to suspect EGR. On acceleration my car stutters around 2k revs, and the first time it happened a can of EGR cleaner solved it for a few months. This time however no such luck, but the same issue.

I do think I may have a boost leak, which is preventing a DPF regen meaning the soot in the system is quite high.

I’m going to have to take it to a specialist though as anything else is beyond my capabilities!
 
Are you having the heater problem associated to the Eco light, low temperature and the fault code also. I do not have any stuttering.
 
Are you having the heater problem associated to the Eco light, low temperature and the fault code also. I do not have any stuttering.
No temperature problems for me, the fault I believe relates to the bypass switch to route exhaust gases to the cooler or keep it closed, it’s entirely possible yours is stuck open (meaning all gases are going through the cooler) while mine is stuck closed (none are). EGR on these engines is tricky to get to which is why I haven’t attempted it!
 
My bypass switch is not stuck. It moves perfectly by hand. The problem therefore is with the vacuum or the vacuum unit. A function of the water pump is also operated by a vacuum unit that is supplied by the same vacuum pipe.

The vacuum units are well hidden but not inaccessible. I just have not got around to checking them out further as I have not got any running issues.
 
Oh ok, can you tell me how to move it by hand so I might try and diagnose mine some more? (Was there any disassembly involved?)

Also if you could post a picture of the vacuum units (if possible) I would be grateful, so I can check them out on mine!
 
Oh ok, can you tell me how to move it by hand so I might try and diagnose mine some more? (Was there any disassembly involved?)

Also if you could post a picture of the vacuum units (if possible) I would be grateful, so I can check them out on mine!

Away on business at the moment but I will do as you requested asap.
 
So my switch over valve has a snapped plastic arm therefore it doesnt work..no symptoms but easy to replace.best to get it fixed as it makes everything work as it should. Picture attached
 

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did you rectify this? ive had this fault code for a long time also
 

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