23-03-2015, 11:21 AM
a good starting point would be to check each individual sensor first.....disconnect the sensor lead and check for a signal from the sensor lead via a digital multimeter....rotate wheel as fast as you can by hand and see an output.........low voltage setting.
I did this test on ours some time ago ( about a year ago now, a resistance check was done for the sensor at the same time ) and saved the data in the manual, which is of course at home!
a NO signal from an individual sensor means a problem with that sensor........
the sensor is basically a coil wrapped around a magnet, whos magnetic field is influenced by the castleations on the abs ring on the wheel......the "vee" strip sticking out of the sensor pointing towards the abs ring is magnetic........no idea what the air gap is........but its fairly close.
our front abs rings where badly corroded, so I carefully removed the corrosion, just in case some "magnetic field fringing" was taking place and upsetting the system.
a new abs bulb ( the bastard who sold the car had taken that and other bulbs out ) and work mentioned above sorted the abs light.
system works cos when the front of the car was up in the air and one wheel rotated in gear, the light came on, which cleared when taken for a quick spin around the block. we have not been in a position to test the system in real life yet and not locked any wheels.....so heres praying!
I did this test on ours some time ago ( about a year ago now, a resistance check was done for the sensor at the same time ) and saved the data in the manual, which is of course at home!
a NO signal from an individual sensor means a problem with that sensor........
the sensor is basically a coil wrapped around a magnet, whos magnetic field is influenced by the castleations on the abs ring on the wheel......the "vee" strip sticking out of the sensor pointing towards the abs ring is magnetic........no idea what the air gap is........but its fairly close.
our front abs rings where badly corroded, so I carefully removed the corrosion, just in case some "magnetic field fringing" was taking place and upsetting the system.
a new abs bulb ( the bastard who sold the car had taken that and other bulbs out ) and work mentioned above sorted the abs light.
system works cos when the front of the car was up in the air and one wheel rotated in gear, the light came on, which cleared when taken for a quick spin around the block. we have not been in a position to test the system in real life yet and not locked any wheels.....so heres praying!