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#1
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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 |
#2
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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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1977 Mercedes 300D |
#3
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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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1960 190D (college car), gone 1995 E300D, 325 k 2019 LEXUS UX 250h (spouse mobile) 2003 Nissan Frontier Crew Cab 2007 Jeep Grand Cherokee Overland 3.0L MB diesel, 185K 1978 GMC Classic Motor Home |
#4
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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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"Poor Krusty, he's like a black velvet painting come to life." -Lisa Simpson
1995 E300D 216k black/mushroom 1982 300SD (sold) |
#5
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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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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#6
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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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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
#7
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Quote:
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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