elgato

I just bought a 2002 C32 about a week ago, everything seemed fine when we drove it home.... Not even two days later I have complete S/C shut off and its very irritating.
I have replaced the I/C pump already thinking it was that but now I have the C/E light on. One of the codes that came up, yes one of the codes , is that its reading a problem with the IAT sensor. I have already purchased it but when I got under the hood I couldn't find it. Also my car went into limp mode once and I read on some other thread that that can happen as a result of the charger not working properly.

So my questions are, where is the IAT sensor located? hopefully this will fix the S/C problem. Also what do ya'll think about the car going into limp mode? It hasn't happened since that one time thank God...

Thanks in advance.

c32used

It does sound like the I/C pump going...when did you have problem before or after changing I/C pump? What mods are done to car?

Gramma_Benz

Could be oil on your IAT sensor. Sorry, I don't know where it is located though.

Check this thread, sounds the same to me:

https://mbworld.org/forums/c32-amg-c55-amg-w203/238486-25-pcv-solution-c32-diy.html

razormb

Check post #18 for location of the sensor

https://mbworld.org/forums/c32-amg-c...r-project.html

elgato

There's no mods on it other than intake filters that I know of, and i just replaced the pump yesterday and its working or at least it sounds like it is. I'm gonna replace the IAT sensor and see what that does. I'll keep ya'll posted

Thanks

elgato

ok this is getting a bit frustrating... Keep in mind I've had the car for barely a week now. I checked the I/C pump and it is working. I took out the IAT sensor its clean I cleaned it again just in case there was something on it. I'm getting reading off of the IAT with the scanner as well, so that would indicate that it is working right? There are 8 codes now related to the evap system (2), secondary air injection (2), and malfunctions with a circuit on all four O2 sensors. The car runs fine but it runs like a regular C320 which is a bit dissapointing

Would all this be a cause for the supercharger not engaging?
I hooked the S/C up directly to a power source and drove it to check and see if the clutch and S/C are boosting and they are.... Power comes and goes, but I would think that is because it is directly connected to power instead of letting the car do it on its own.
It seems to be a electrical problem has anyone experienced this before? And if not any ideas are more than welcome

thanks again

c32used

Your I/C pump could be starting to fail...if power does come on then shuts off it really sounds like the I/C pump is failing even if you replaced it once maybe its going out again... Even the Johnson pump has been known to fail I believe AMG Jerry had first one that failed at around 5k miles use...the other IDK...triple check that I/C pump...as for the other warnings you need to look and see if you are modded in anyway thus maybe somewhere in those mods the failure is starting GL

elgato

I just replaced the I/C pump two days ago I think. So I'm pretty confident that I can rule that out. The S/C does not kick in at all no matter what temps or speed I doing. Ugh I just hope I didn't make a mistake in buying the C32 lol.

c32used

S/C not kicking in may mean S/C is possibly bad...Ebay had one foe $350 but it sold today...Did you get an aftermarket warranty? I always say its a must have especially for the C32. I love my C32 but can't say it was flawless but the aftermarket warranty fixed most the common problems which seem to stop being a problem after the fix. I say go to a MB dealer and have them analyse it and if its the S/C post a wanting to buy in the classified and link it here. Maybe the guy who bought the Ebay one will sell it to you. GL

Calspeed

I have nothing to add as you guys have done a fine job. But I do want to say that I was impressed with the way everyone that chimed in was helpful and not rude by pointing to the search mode etc.

I would like to say that it would be a decent gesture for the author of this thread to make an introduction at the very least. We have alot of good people here on the MBW.

Sound fair? meow...?

Miguel

warnhammarc32uk

I would have to agree with how nice everyone was in not pointing to the search function. It really annoys me when you go on a forum to ask a question and all you get told is to use the search function!

It sounds like you may have a few problems with the car and the owner may have had the faults reset before you collected it. I had the secondary air pump go on my car- you can reset the fault and it can take a couple of days for the check engine light to come back on.

Take the car to an MB dealer and they should be able to give you an accurate diagnosis of the fault without a commitment for them to undertake the neccessary work. You can get them to diagnose, and then DIY or get an independant specialist to fix the faults for you.

I always have my car serviced at an MB dealer but always take it to a friend who works for an independant mercedes specialist for major repairs.

I hope you find your problems quickly and that your initial bad experience does not put you off what is truly a great car. I had loads of faults when I first bought mine. There are a few common issues with the car and I just seemed to have bought the car at the point in its life when the faults occured. It has given me much trouble free and exciting driving since!

Your problem does sound a bit like your sc pump has gone.

elgato

I'm sorry for not introducing myself I live in Houston and as I stated before I have had the car for about a week. I'll try to post some pics later on. I did search the forums before asking for help and thats how I found out that one of the main probelms with the C32 is the I/C pump. I acctually have a lightning I/C pump that I installed with the help of the search button. I got a friend of a friend to help me check out the car and all he works on are mercedes, so hopefully he'll find out whats wrong with it.

Again thanks guys and pardon my newbie manners I appreciate all the intel.

Jorge

ScottW911

Just a thought but, have you taken a look at the front passanger side of your S/C, near the pulley. There is a black plug in that area. It powers the electro-magnetic clutch on the S/C. Make sure that the plug is properly connected. If it is not, the car will never make any power. I would love to hear that this was all that it was.

Otherwise, keep on top of ebay and the occasional S/C that pops up there. I bought one for a spare as my S/C clutch is chirping and jerking. The one that C32used referred to is from a seller that has sold 2 in the last week. Check the thread in this forum on the supercharger for sale.

1qikctr

^^ check the plug, are u sure u replace the IC pump right?

elgato

So I got the news today. Everything is fine. Engine is good I checked all the wiring thanks for the reply scottW911. My probelm is the S/C....

My friend hooked it up to the MB dealer scanner and the car spit out two codes that deal with the supercharger: P207c (supercharger) Mechanical fault (P0660) and P208C Y2/1 (supercharger magnetic clutch) , Electrical fault (P0235). He told me that I need to replace the clutch and supercharger and that can be a good resason that the car is coming up with all the emissions codes. So much for a easy fix lol . I already posted a WTB thread on th classifieds and I'l be looking out for another S/C on ebay as well. The whole job with a new clutch and S/C including labor is gonna be about 6k! Oh goodness what a way to come into the benz world ha ha.
Thanks for all your help guys and thanks for welcoming me into the MBW.

Oh and one more thing if ya'll hear of a good S/C F/S please LMK.

EURO KNG

There was a s/c for really cheap on ebay for like 300$ but it got sold.

ScottW911

PM boohooramblers. He recently admitted to hoarding several C32 S/C's. If you want to take a chance that they might not be perfect S/C's, go for it.

Sorry boohoo, I couldn't resist doing this after you said you had multiple spares.

ChicagoX

boohooramblers

elgato - Apologies in advance for the length of this post. Hopefully it will have some information that you find useful.

If you don't feel up to reading further, the bottom line is that I have a spare supercharger that I can offer you. However, as alluded to in Hooleyboy's thread, I certainly wouldn't put it on my own car because I can't vouch for its condition. It appears to spin freely, but I've already made my thoughts known on that subject!

Let's summarize your findings:

1. You have a 2002 C32 (what is your mileage?)
2. Your supercharger disengaged.
3. Your car goes into 'limp' mode. This is NOT always normal for supercharger disengagement and can equally suggest a completely different problem.
4. You changed your intercooler pump, but the problems still arise and you have 8 error codes.
5. You supplied power to the supercharger and it works (albeit intermittently).
6. You have an MB tech detect 4 errors pertaining to the clutch and supercharger.

Your error codes suggest anomalies in the following systems:
A) MAP sensor (B28)
B) Air temp sensor (B17/8)
C) Supercharger clutch (Y2/1)
D) Secondary air injection pump (M33)
E) Intercooler pump (M44)
F) Other evaporative emission control components
G) Oxygen sensors / catalytic converter sensors.

I think you have a more significant problem at hand and it is rather 'convenient' that the MB tech diagnosed the problem as a FUBAR supercharger (+ clutch) to the tune of $6,000.
Is it plausible that the MB Tech is correct and your supercharger and magnetic clutch are bad and this led to all the other codes?
Perhaps.

BUT.....
There's no doubt that you have tested some of the components that may be in play; however, I suspect the proper diagnosis may require a more empirical approach. Analyzing codes and problems at one time point is useful. Analyzing codes and problems over multiple time points is more useful!

Before you commit to forking out for the parts and labor to fix these issues, I would go through each system with a fine toothed comb.

I would argue that the scope of the error codes that are being detected is too broad for it to be solely a supercharger issue.

Let me make my case for exhausting all other avenues first:

1. Our ME-SFI system is rather complex and has a wide variety of input and output signals. Many signals are interdependent on others; however, some appear to act/function autonomously.
See the diagram below for an overview of ME-SFI input and output signals.

One thing that upsets the ME-SFI is fluctuations in voltage.
Have you checked your battery to make sure there aren't subtle variations in voltage across circuits? Are you sure your harness is fine?
Another issue could be the presence of an aftermarket tune on your ECU.
You purchased the car used. Although you can't see any aftermarket hardware on there (except for filters), is it possible that the car had an aggressive tune with lots of hardware? If the hardware is now removed, you could still have the tune and subsequent problems. Who did you purchase the car from? You REALLY need to ascertain whether the car was heavily modified (or not).

.


2. Analyze the systems that initially triggered the error codes. Let's start with the air intake temperature sensor (B17/8). Implausible readings from that will obviously lead to supercharger engagement issues. See the composite diagram below of B17/8. It's proper function is critical. Check the fine wire on the sensor to make sure it wasn't damaged (especially when it was cleaned). You said you are getting readings from it from a scanner so it probably is working. You never know though!




3. Analyze the MAP sensor (B28: boost). Again, implausible voltage readings from this going to the ME-SFI will cause issues in supercharger engagement. See diagram below for how B28 interfaces with the ME-SFI.




4. Check your secondary air system components. I am going through these issues right now and I'll write more on the subject at a later date.
Is your secondary air injection pump (M33) functional? It wont prevent supercharger engagement, but you should check it out anyway. Make a note to check the relay and fuse associated with M33. See the diagram below for the location and identification of the relevant relay and fuse.




5. Importantly, your charge air coolant system needs to be investigated further. You changed the intercooler pump (M44) for the Ford Lightning unit and you know the pump works. However, are you sure that the coolant system is properly bled? There are multiple references to bleeding the system on the W203 and W211 AMG forums. Finally, check the fuse for M44. See diagram below for the location of the fuse and check out the relay listed also.




6. (And finally!) Check the supercharger engagement issues separately. Before you fork out mucho $$$$ for a replacement supercharger, you should test the hypothesis that the clutch (Y2/1) is the culprit. See the diagram below for how the clutch and supercharger integrate. Remove the clutch and replace it with a suitable replacement that you know is functional. If everything else alluded to above is deemed operative (as well as the clutch) and you still don't get supercharger engagement, then yes - you have arrived at the conclusion that your supercharger is dysfunctional.

MRAMG1

Boohoo, YOU THE MAN:

Whoa, splinter you have competition

For real guys, both of you ALWAYS post GREAT knowledge, instead of the BS that others do, thanks for being members, and thanks for the GREAT posts

See yeah

PS: Did I mention I am now on the W220 post

redfarsi

I hope you have a warranty.

elgato

Boohoo you are the sh*ts thanks alot I'm gonna check all this stuff out. There might be something wrong electircaly. I was driving home today and my radio didn't work and then the car was telling me that there was something wrong with a light sensor, but then I turned the car off and everything went away....
Can anyone reccomened a shop in houston to check out the car? I work at a shop but we are no mercedes specialist

One more thing when I was checking the ESP system a code came up dealing with the CAN I can't find the paper that I wrote it on but it said "system faulty" Didn't know what that was till I saw the first pic on boohoo's post. Could this be the issue??

splinter

Outstanding post, boohooramblers. Its spot-on text and graphics ought to be archived in order to aid those whose C32 is merely performing as they all will at some point - if they haven’t already.

No 'competition' per se between boohooramblers and me. He’s a highly-educated scientist who has, thankfully, elected to share some of his vast knowledge and insight with us.

Many have learned more from him than any other currently active member - myself included.

loungn14

ya, good info....thanks for the post

ScottW911

boohoo,

Wow. You are such a wealth of knowledge and cool pics. Please, please, please..never sell your C32 and leave the rest of of hanging.

By the way, I think you and splinter are equals in my eyes.