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  #1  
Old 04-13-2005, 04:28 PM
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E300D (M606) how to I test the tach sender

Hi i need advice here ( and yes I have searched extensively and not found anything specific to the M606 unit which is different to the tacho senders on the older ones in the posts I have read).

I think my tach sender might be dud as my tacho is intermittent and so is my A/C.

So far:

I found a two core cable coming through firewall into duo valve area with plug and socket. when i broke this the tacho stopped completely so I think this must be the sender cable.

First question: I measured the a/c voltage on the pins with the engine running and it hovers just below 5v - is this about right?

second question: The cable dissappears downwards behind the the oil filter housing . How do I get to the tacho sender to remove / clean and do further tests? do I have to remove the oil filter housing or inlet manifold to do this? or is it possible to get at it from below? I dont even know what it looks like or how difficult it will be to find/remove.

If the tach sender checks out OK what else could cause both the tacho and A/c to be intermittent ?. My thoughts are Klima (but this wouldnt affect the tachometer or would it?) or EGR relay? I have already tested OVP and its ok.

any advice really appreciated as I am keen not to buy parts until I am sure I have isolated the item at fault.

thanks in advance
Keith

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  #2  
Old 05-20-2007, 02:10 PM
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Reviving this thread!

Hi guys,

I am having a similar issue on my 95 E300 Diesel. The tach does not work when the engine is cold, but after about 45 min or more of driving the tach, comes back to life. The AC is however always operational. Any thoughts?
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  #3  
Old 01-13-2009, 10:29 PM
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Unhappy 1995 E300D tach cable

The tach died today, I ran a parts searh and it shows a combo speedo/tach cable.

Any thoughts?
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  #4  
Old 01-13-2009, 10:57 PM
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Two words, OVP relay.

These were exactly my symptoms when I first bought my '95, no tach and no a/c. A new relay did the trick.
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  #5  
Old 01-13-2009, 11:11 PM
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Agreed, for the 1995 E300D (OM606) in the W124 chassis. The 1996 model has a fancier version of that relay, called "K40." It does the same thing (and maybe more) and costs more, of course. The K40 relay lives in the black plastic box just forward of the firewall on the right side of the engine compartment, about where the battery would go if it were there.
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Old 01-13-2009, 11:22 PM
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For the UK guys, I believe it's the left (passenger) side from the driver's perspective on the W210s.
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  #7  
Old 01-13-2009, 11:56 PM
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Quote:
Originally Posted by Jeremy5848 View Post
Agreed, for the 1995 E300D (OM606) in the W124 chassis. The 1996 model has a fancier version of that relay, called "K40." It does the same thing (and maybe more) and costs more, of course. The K40 relay lives in the black plastic box just forward of the firewall on the right side of the engine compartment, about where the battery would go if it were there.
The K40 does more and less. It contains several relays, but no over-voltage sensor. One of those relays serves half of the function of the prior OVP.

In the diesel 210, the IFI computer detects the over-voltage condition and switches the relay off at the K40. In the 124, the OVP did the whole job.

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