Transmission Position Sensor/Switch: Description and Operation

Dual-Linear Switch (DLS)
The TCM detects gear selection by means of a switch fitted to the 'J' gate, the DLS contains two multi-track slider switches, of which the upper controls P R N D and the lower 4, 3 2.
Output from the DLS is changed as the selector lever is moved, thus indicating selected gear position. The parallel signal is input to the TCM by 4 discrete logic wires WO, W1, W2 and W3. The particular sequence, or gray code, will indicate which shift position is selected, as shown in the following table where 0 = low and 1 = high:





Gray code