LR3/Disco 3
The gear selector lever assembly is located in a central position on the transmission tunnel, between the front driver and
passenger seats and is secured to the transmission tunnel closure plate. The selector lever comprises a moulded plastic
housing which provides for the location of the selector components.
The lever is connected to a crosspiece which allows for the selection of P, R, N, D in a forward or backward direction and
selection between automatic and manual/sport mode in a left/right transverse direction.
When manual/sport mode is selected the lever can be moved in a forward or backward direction to select + or - for
manual (CommandShift™) operation. If left in Sport mode all gear changes are performed automatically.
If Manual (CommandShift™) mode is selected, all gear changes are based on inputs received by the TCM from the
manual +/- hall effect sensors located on the PCB.
The selector lever mechanism houses the following components:
Electronic Printed Circuit Board (PCB)
Shift Interlock solenoid
Park and Neutral locking levers.
There are four selector lever positions and two additional positions for manual/sport operation:
P (Park) - Prevents the vehicle from moving by locking the transmission
R (Reverse) - Select only when the vehicle is stationary and the engine is at idle
N (Neutral) - No torque transmitted to drive wheels
D (Drive) - This position uses all six forward gears in high and low ranges
M/S (Sport Mode) - This position uses all forward gears in 'D' but will upshift at higher engine speeds to improve
acceleration
+ and - (Manual 'CommandShift™' mode) - Movement of the selector lever in the +/- positions, when the lever is in
the M/S position, will operate the transmission in manual (CommandShift™) mode allowing the driver to manually
select all six forward gears
The selector lever position is displayed to the driver on the selector position LED display and in the instrument cluster. In
'CommandShift™' mode, if a gear is selected but the TCM logic prevents selection of that gear, the requested gear will be
initially displayed. The TCM will engage the next allowed gear and then display that gear.
Sport/Manual +/- CommandShift™ Switch
The PCB contains the hall effect sensors to activate the sport/manual mode and also the sensors which provide the +/-
signals. When the selector lever is moved to the manual/sport position, the lower magnet located in the selector lever is
moved within proximity of the M/S hall effect sensor on the PCB. This provides the momentary signal which is received by
the TCM, which in turn initiates sport mode.
When the lever is moved to the + or - position, the magnet is moved within proximity of one of the hall effect sensors
positioned either side of the M/S hall effect sensor. When an input from either the + or - sensors is received, manual
CommandShift™ mode will be initiated. In this position a spring will move the selector lever back to the centre position
when released. To leave the CommandShift™ mode, return the lever to the 'D' position.
Selector Position LED Display
The P, R, N, D LED display is located on the right hand side of the selector lever and the M/S (MANUAL/SPORT) +/- LED
display is located on the left hand side of the selector lever. Each LED display is connected via a separate harness to the
selector lever position switch. When the lever is moved to the required position, the switch contact for that position is
made and the LED is illuminated.
P, R, N, D Position Switch
The P, R, N, D position switch is located within the Mechatronic valve block in the transmission. The switch is operated by
movement of the selector lever to the P, R, N or D positions via the Bowden cable which is connected between the
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Seal
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Selector cable
