Gearbox Sensor Mk3/AR
Posted: 07 Mar 2011, 12:09
Mk3 and AR have a gear selector sensor which incorporates the neutral switch.
In the AR the ECU definitely changes its output dependent on the gear selected. It seems unlikely that this isn't also true for the Mk3.
There are three wires on a Mk3 sensor - green/black, green/yellow & green/red. From testing there doesn't seem to be any inter-relationship between the wires. There is infinite resistance between them and the engine casing (earth) except when in certain positions where there is no resistance. This happens once in 360 degrees for the green/black & green/red wires and twice for the green/yellow wire.
(Edit - After Looking at these results I think they maybe wrong in that it makes more sense if two wires have two points when the resistance is nothing. One of which works for both wires. Maybe I'll have another look sometime.)
In the AR the ECU definitely changes its output dependent on the gear selected. It seems unlikely that this isn't also true for the Mk3.
There are three wires on a Mk3 sensor - green/black, green/yellow & green/red. From testing there doesn't seem to be any inter-relationship between the wires. There is infinite resistance between them and the engine casing (earth) except when in certain positions where there is no resistance. This happens once in 360 degrees for the green/black & green/red wires and twice for the green/yellow wire.
(Edit - After Looking at these results I think they maybe wrong in that it makes more sense if two wires have two points when the resistance is nothing. One of which works for both wires. Maybe I'll have another look sometime.)