Where is the cooling fan for the electronic modules on a 600 SEL??
 

Hello All,
I have a few questions concerning a 92 600 SEL.
I have thought about it and decided to ask one or two questions in each post.
If anybody feels that would NOT be OK, please do let me know.
The car had 125,xxx miles on it, when the check engine light came on and the car went into limp mode shortly thereafter. Whenever the car is stopped for 30 or so minutes and upon restarting, the engine functions normally, but half an hour to an hour later it goes into limp mode again! Which led me to think the malady is time sensitive!
Upon checking the stored fault codes, one which attracted my attention was that one of the electronic modules under the hood is over heating.
I tried to locate the cooling fan responsible for cooling the electronic modules but failed because I don't know where it should be and I can't trace any sound it should be emitting (the fan, that is)
I'd appreciate it if anyone can tell me where to look for it and/or if he/she thinks it is/ is not the culprit.

Thank you.

I would suspect your setup is like mine, with the box containing the modules where the battery usually is on other models (i.e., in the right side of the engine bay, towards the firewall). In the 400E, the module box is cooled by two hoses which run to the climate control fan and circulate air from the cabin into the box.

Do you have the CD-ROMs? I think the info is in there somewhere ...

That code isn't important to the operation of the car!! IN fact in later cars the fan was deleted! What codes are in the engine management computers? You need info from SIX(6) different computers on that car to determine the problems!

Here are the codes
 

Steve,
Thanks for the reply. I have CD's for the 126 but none for the 140, I did not know they were available! please tell me where I can get them.

M.B.Doc,
Thank you too for the reply.:D
I would still like to know where the fan is. If it is the climate control fan as Steve has indicated, then what happens when you don't run the AC system for whatever reason?
To address your point about the codes, here are the codes from those systems which did report error codes:

1-DM-LH--->06(Idle speed control inoperable)

38(I could not find out what this one is)

05(Exhaust gas recirculation inop) Could this be the reason behind a mysterious clicking noise which emanates from underneath the passenger side intake manifold while the engine is NOT running(very much like the clicking sound you hear when the starter solenoid is not getting enough current)

47(Could not find out what this one is, either)

2-OP(Could not find out what this system is!!)
---->05(Module box int. Temp Beyond Limit)

06(Cooling comp E1 temp/Electromagnetic clutch close tightly)????

3-SPS--->01(Speed sensor itive power, steering module faulty)
I don't know what "itive" is! Could it be a truncated positive?

4-RST---->03(Limit sw right locked)

05(Limit switch right closed)

16(Limit sw roll bar retracted??) Does the car have hidden desires to be a convertible??

18(Lim sw right front door)

19(Veh. speed signal illogical. Can only be read to control ver 7.6


I apologize, I tried to format this post so it would appear semi intelligible, alas it is not cooperating.:eek: :eek:

From Alldata:

OPERATION
The control units are located in the module box and therefore protected from dust, water, oil and other substances that could damage them. Some models are equipped with a blower motor (M2/2) that controls the temperature in the module box (Phased out during MY 1994). The blower motor is in operation:

- For 1.5 seconds after engine start if the engine speed exceeds 1200 RPM.
- If the temperature in the module box is above 60 °C (140 °F).

If the module box temperature exceeds 70 °C (158 °F), the base module will store a malfunction code.

Kayooh
I think you doing something wrong reading the DTC. What kind of scanner do you use?
You need to get codes from relevant computers:
LH --
EZL/AKR --
EA/CC/ISC --
BM --
DM --
ABS/ASR --

(MBDOC - are these the SIX your were talking about)

If you reading of the DM code 6 is correct, it would cause limp mode. This code maybe there because somebody moved throttle control linkage from the engine compartment. If so reset it. I would reset it anyway and see if it came back.
Code 5 is Right EGR (left side of the engine) wouldn't put it in the limp mode (but will turn MIL on). This is most likely not the EGR valve, but the small hole into the intake manifold needs cleaning.
I don't think any other codes have any relevance to your problem.

Myarmar,
The scanner I am using is the Trisco palm scanner ver. 3.0
The unit is brand new and was tested on only one W140 car before it got to me.
I was going to do some more scans after the initial one but the weather has been anything but nice here in central Texas in the past few weeks.
I seem NOT to function very well in that kind of weather and as such I have not done it yet.:D
I missed on doing it this past weekend as things has improved dramatically over the weekend.

Speaking of the throttle control linkage, what do you mean by resetting it!
Is that a mechanical resetting or an electronic resetting you are referring to and may I ask how is it performed?

Thank you.

I mean reset DTC with the scanner and see if it came back. After you read the codes scroll to the 'Erase DTC' menu item and select it. Follow instructions. The code 6 is an indication of the faults present in EA/CC/ISC module and these faults have to be read and erased first.
Same for code 5, read codes from LH modules and erase first. Then erase DM codes.