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ABS light / Sensor testing
Topic Started: Wed Jan 27, 2010 4:46 pm (2,241 Views)
snakehips916
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Snakey
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My ABS light has been on for 3 months. I can handle that but now its MOT time and it wont pass.
I have replaced OVP relay and car starts fine now (didnt before).
I took the car to a German 'specialist' who said, £50 later, that their machine wouldnt communicate with the ABS! They said it must be the sensors or the ABS main unit.
a) does this sound likely?
b)How do i test the ABS sensors?

Any help is most welcome and I thank you in advance.
I don't have money to throw at this as I recently lost my job. Someone drove into my motorcycle and wrote it off as well so at the moment I have no transport........zzzzzzzzzzz:roll:
Edited by snakehips916, Wed Jan 27, 2010 4:51 pm.
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aemt
Serial 190E Owner
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Enter ABS in the search feature. There are quite a lot of threads that eal with this issue. Unfortuntely quite a view of them do not have the outcomes posted. Best way is to check the sensor connections with a multimeter you are looking for a value > than 1. Also check the relays on the top of the ABS pump and the ECU behind the battery.
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snakehips916
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Snakey
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I presume the value greater than 1 should be ohms? How do i check the relays and ECU?
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snakehips916
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Snakey
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OK. I have checked all pins in ecu and relay connections on ABS unit. OVP is still fine. Took the car for a spin and tried several emergency stops. ABS is working but ABS light is still on.
I checked the front sensors with an ohmeter and the left one is reading 987 ohms and the right one is 976 ohms. It is getting dark so didnt check rear sensor. I presume they were the sensors........the connections looked like large tv aerial connectors....one either side of the car mounted by plastic clips!

I checked battery is charging and got a reading of 14.05 volts

Any ideas what else it could be?
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balamb37
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Grumpy Old Grampa with Dog
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Have you had a look inside your OVP for cold joints (little black rings in the soldering) it's a common fault. have a look at Kentronix Pinned at the top.
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snakehips916
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Snakey
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It is a brand new ovp relay and I ahve also tried another. It is not the ovp relay
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