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Hello, usually 9 times out of 10 the fault will lie with the ABS sensor in one of the wheels, when this fails it will not send a signal or it will send a false signal causing the light to illuminate, it would be hard to diagnose without any equipment but we can start with the basics, does it come on and off or is it on permanantly.?
It does sound like a wheel sensor then, if the fault lied in the ECU it would be on permanantly, i would advise the garage to check the ABS sensors, most garages should carry a kit that can diagnose this,and it automatically requests a phone call, please ignore that. it is not necessary here,
Its ok, if teh garage doesnt hold the kit to test abs speed sensors they can sometimes loan them from another garage, or you will have to take the vehicle to a different garage,
I am not local to kent so i cant recommend any, a reputable HGV/ Commercial garage should definitly have the ABS test kits , they are the same for any vehicle as the probes push into the sensor , my only other advice would be to check local commercial garages near you if they have the kit, .
Yes they all work the same, they measure speed and send a signal voltage back to the ECU that works out how fast the wheels are turning and weather they have locked up or not, the kit comprises of a device that can either plug into the sensor (common manufacturers) or for exotic / foreign vehicles theres an adapter that has 2 small pins you can push into the sensor connectors, you then rotate the wheel by hand quite fast a few turns then monitor the signal , the kit also tests the ring that the sensor reads to make sure the ring isnt cracked or rusted over, this can be a common problem but its more than likely the sensor.the garage may have to go underneath the vehicle or remove some trim panels to locate the sensor wiring plug, and to replace it the wheels will need to be removed.
it would be wise to fit a new sensor
the abs sensors are located in the wheel HUb, the ring that the sensor reads is located in the back of the hub, most of the time on the brake disc, and im unfamiliar with the vehicle you own but it shouldnt be a major job to change.
Thanks Tony, i hope you get the RV sorted asap, thanks for contacting me. Marc