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Old 28-12-2016, 11:53 AM   #1
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W124 E300d OM606 fault find question.

After replacing the glow plugs on my OM606, recently on start up the following has been happening - ABS warning light on, Rev counter stuck on 0, and idle too weak to move the car when in gear. This is intermittent but becoming permanent. It either all happens together or no faults at all.

Just checked the fuse on the OVP relay which was fine (but will be replaced anyway).

Any other suggestions to check?
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Old 28-12-2016, 04:49 PM   #2
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Maybe the OVP relay itself? A functioning fuse does not necessarily mean the relay is ok.
Have you checked your alternator output? I've had two fail in my time, both times the first symptom was the ABS warning lamp. The rev counter is a voltmeter I believe, maybe your battery is sucking up what little charge there is available from an ailing alternator?
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Old 28-12-2016, 05:38 PM   #3
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The battery is not in the best of shape but was fully recharged before I fired her up. I'll check the OVP relay.

Another suggestion made elsewhere was the loom might be in poor shape, which is certainly the case with the glow plug relay loom.
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Old 28-12-2016, 06:03 PM   #4
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Another vote for the OVP ABS light is a classic fault indication OVP supplies abs controller, engine ecu and motorised rotary fast idle valve [ on petrols at least] the soldered joints crack with vibration
Numerous guides how to resolder them online.
here's one.-- other guides may be available.
BORKED
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Old 30-12-2016, 10:36 AM   #5
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My old skills have returned. Removed the OVP relay, cleaned all the connectors, removed the metal shell, re-tinned the connections as per the vid and lo, the car now won't start and the ABS light remains on...

My initial thought is the loom is the likeliest problem. Getting the OVP relay in and out of the connector required a fair bit of tugging.

Starting to think the car needs to be disposed as it has far too much to do to get it running, even before all the work on the body required.
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Old 30-12-2016, 11:58 AM   #6
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SOME BASIC VOLTMETER TESTS
OVP - basic function and test - Mercedes-Benz Forum
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Old 30-12-2016, 06:33 PM   #7
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Thanks Graeme, I'll have a check to see if it is the OVP relay at fault.
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Old 30-12-2016, 07:06 PM   #8
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Quote:
Originally Posted by Charles Morgan
Thanks Graeme, I'll have a check to see if it is the OVP relay at fault.
let me know if you wish to test with my OVP. My car is laid up for winter.
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Old 30-12-2016, 07:29 PM   #9
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http://www.w124-zone.com/downloads/M...is/54-0242.pdf
SOME CIRCUITS
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Old 31-12-2016, 11:09 AM   #10
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Tested just now. The relay is clicking away intermittently but testing the pins as per the link above, the highest voltage I got was 2.4 on one. So the OVP (or my testing) looks faulty.
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Old 31-12-2016, 11:50 AM   #11
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http://www.autolib.diakom.ru/CAR/Mer...GRAMS/4455.pdf

time to try a substitute relay?
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Old 31-12-2016, 05:16 PM   #12
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That will be the next thing.
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Old 31-12-2016, 07:05 PM   #13
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Very kindly indeed, Neilrr just popped over with 4 OVP working relays so I can test away with enough to be certain whether it's the OVP or the car. The forum at its finest!
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Last edited by Charles Morgan; 31-12-2016 at 07:27 PM.
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Old 01-01-2017, 09:46 AM   #14
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Success! First OVP relay in and it fires up, idles properly, rev counter works and ABS light gone. Many thanks Neil!

So now to get all the manifolds back on after changing the glow plugs and get the car back on the road.
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Old 01-01-2017, 09:49 AM   #15
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Result! Might be worth getting your alternator output checked at some point as a precaution?
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