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Old 26-08-18, 06:04 AM   #1
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Default ABS ESP Lights on constantly

Hi

Both lights are constantly on, from turning the key and through driving.

Ive had it on the computer, and was told its an open circuit on one of the rear wheels (O/S/R)

Ive done a resistance check across the abs sensor an am reading a constant resistance of 1,7.

I cant see any evidence of damage on the wiring.

Any other ideas?

Thanks

Dave
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Old 26-08-18, 07:39 AM   #2
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I expect that, if you have an open circuit in the wiring, you would get no reading if you measure volts and ohms into the unplugged connector. If that does not work, try spraying contact cleaner into the mating parts of the connector.
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Old 26-08-18, 12:34 PM   #3
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Yea tried that, next step, if ot stops raining it to put a volt meter on the pins. And see if i get a reading when the wheel is turned.
Desperately trying to find the issue on the wheel!!
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Old 26-08-18, 03:52 PM   #4
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Just because you have a resistance across the sensor only means the sensor is OK. It does not mean that it is transmitting motion when the wheel is turning. Known fault on the rears of rust build up beneath the sensor causing the sensor to move out of range of the pick up. Best to remove each sensor and ensure that their are no signs of rust and that the sensors can mount flat and square on their mounting pads.
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Old 26-08-18, 04:23 PM   #5
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It ususally says "short circuit" on 407s when the sensor is duff. (407s eat ABS sensors).

Just change the sensor. They're about a tenner.
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Old 26-08-18, 04:47 PM   #6
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Mine has got esp, this light is on as well as the abs light.
Its the fact that both lights come on with the ignition, and dont go out. In the past if it was the sensor, they went out until the wheels move.
Also, form what i can see is if the car has esp its a different sensor!! Is this true or a sales ploy to buy the most expensive?
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Old 29-08-18, 08:24 AM   #7
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Ok

I've found an open circuit on one of the rear wheel sensors, ive taken the gamble and ordered a replacement.
When I replace it, will/ should the dashboard lights go out if I have solved the issue? Or will I have to have them switched off on using a computer/ code reader?

Thanks

Dave
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Old 29-08-18, 09:30 AM   #8
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I thought you had reported the sensors had a resistance so how has it got a open circuit? Is it the sensor or the wiring to it?
Anyway, when they are all ok as soon as you drive beyond the trigger value(5mph or so) the ABS computer will see that all wheels are recording and the light will go out.
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Old 29-08-18, 10:27 AM   #9
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I missed a key piece of information, I was told the O/S/R sensor was open circuit, it was that one showing resistance, I then checked the N/S/R sensor to see if that showed the same resistance, but that showed open circuit, so Im guessing either I was told the wrong side, or I got mixed up!

Not counting chickens, but part should arrive tomorrow, and ill see!
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Old 29-08-18, 11:30 AM   #10
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If its a 307 it could be the sensor gap issue, well documented on here.
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