ECU fan failure / 10A fuse blown

wportre

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My wife has broken down near Lockerbie in our W210 2001 E240. Always on a Sunday, always in the... (settle for "remote")... It threw ABS/ESP faults and would not start after a stop.The AA patrolman (of course: with this car, are you kidding!!!) informs me it is a known problem with the ECU fan seizing and blowing a 10A fuse. He is relaying her to St Andrews, her destination. We will need a tow to a repair tomorrow. (AA man says that temporary fix of a fuse replacement will roll, but obvious danger to the ECU.)

2 questions:

1) Does this make sense and is the repair likely to be reasonable (hard to avoid a $dealer: I'll be 500m from my indy...)

2) Anyone know of an indy near St Andrews?

Cheers

WP
 

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Yes an easy fix,,, just take away the fan and insulate the wires, replace the 10amp fuse and away you go. the fan is not needed
 
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wportre

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Thanks guys: I've since found your posts. My bad and sorry for the extra thread. I trust you both implicitly but are you sure that's OK: the AA man said they are no longer allowed to make that mod due to fried ECUs.

Why do you say "not this country": the cool environment? does that mean at least on current weather are you sure it will go 500m home?

Sorry: I sound a bit weedy but I wake up screaming at the idea of a dealer and an ECU in the same room and here I am potentially...
 

television

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Thanks guys: I've since found your posts. My bad and sorry for the extra thread. I trust you both implicitly but are you sure that's OK: the AA man said they are no longer allowed to make that mod due to fried ECUs.

Why do you say "not this country": the cool environment? does that mean at least on current weather are you sure it will go 500m home?

Sorry: I sound a bit weedy but I wake up screaming at the idea of a dealer and an ECU in the same room and here I am potentially...

The fan is not needed in the UK and the fault has nothing to do with the actual ECU,,it was only for the cooling of it,,so cut the fan wires,,insulate them,replace the fuse and drive the car home.

This is an MB standard mod and still valid
 
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wportre

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Thank you both very much. I've lost control of the car to the AA now but I'll make sure it's the simple repair. I really appreciate it.

Love this forum.
wp
 

television

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Thank you both very much. I've lost control of the car to the AA now but I'll make sure it's the simple repair. I really appreciate it.

Love this forum.
wp

I can Email the works instructions to you
 
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wportre

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Cool: yes, thanks. As you said: 2 replies in 2 minutes and an easy fix. As I said: you rock. I just hope my thread on 722.6s that stall gives a little back to the forum when the weather gets cold again.
Cheers.
 

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I have sent it it is a RHD car mod only :D:D
 
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wportre

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All gone a bit t*ts up. Mod worked till the car threw a mass of faults after 20-odd miles and went into limp-home. Garage that did the mod (not a Merc specialist) now washing its hands (in form of rewiring fan as was with new fuse and cleared all faults. New fuse has not blown. Wife on way to Merc garage (not sure if dealer or indy) in Dundee. A proper jam (groan.) I'm guessing there's water around, which is odd as the car has not been rained on for weeks. My dealer/ECU nightmare gets closer...
 

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That is sad,,so sorry this has happened,,we never know if the guys doing these jobs disconnect the battery before doing these things.. There has been the odd fault where the Maf can lose its coding when the battery has been disconnected and requires re coding, that could put it in the limp home mode
 
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wportre

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All OK and thanks for the help

Malcolm that indeed seems (hard to tell from 500 miles away) what has happened. You are amazing :)

The dealer in Dundee (having gone straight for the crank sensor, which was fair enough) found nothing, re-disconnected the fan, did some road-testing, put it on the machine and gave a clean bill of health. Cost me an hour's dealer diagnostic time to add to the original £30 for disconnection but nothing untoward and worth it for peace of mind. She's now 290 miles back towards home and running like a top (mpg has soared-33 on this run-since I replaced the spark plug leads: wretched Bosch).

One last question: where is the ECU cooler fan? Off the main ventilation air intake? I suspect it has fouled with tree litter or similar and ideally would like to free/reconnect it if that is the case.
 

television

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You do not put the fan or a fan back,,it is recognized by MB that it not required in the UK hence RHD only.

The fan is in the control fuse box and not open to any incoming air,,it did the same job as a fan connected to a computer ECU.

Though this fault been known for a long time now, no one has had a problem in taking it away
 

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