Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

High range actuation sequence
Shifting sleeve1
High/low shifting fork2
Shifting cam3
The rotational movement of the motor shaft turns the
shifting cam (3) to high range position. The shifting
cam then moves the shifting sleeve (1), via the high/low
shifting fork (2), into the high range position. After the
synchronisation sequence, the planetary ring gear is
connected to the high range dogteeth, via the shifting
sleeve, on the differential carrier. In this position, the
input speed equals the output...

MULTI-PLATE CLUTCH ASSEMBLY
Clutch hub1
Cup springs2
Clutch plates3
Clutch piston4
Motor levers5
Ball ramp mechanism6
Sprocket7
The multi-plate clutch assembly for both centre and rear
differentials act in a similar way. The aim of the
multi-plate clutch assembly is to prevent excessive
differential slip and therefore maximise the traction
performance of the vehicle. This is fundamentally
different from the braked traction control, which can
only counter act differential slip when it occurs.
A certain...

the clutch hub (1) as support for the clutch plates (3),
the clutch piston (4) to generate friction between the
clutch plates, and a pack of cup springs (2) to return the
clutch piston into its original position.
One set of friction plates are connected to the clutch
hub; the other set of friction plates are connected to the
multi-plate clutch basket, which is welded to the centre
differential housing.
Multi-plate Clutch Actuation
Transfer box motor levers in initial position, multi-plate clutch open...

Ramp mechanism balls5
By turning the clutch control disc (3), via the motor
shaft (2), the motor levers (4) are rotated relative to each
other. This relative movement acts on 5 balls (5) in a
ramp mechanism between the two levers and give a
defined axial movement. The movement forces the
clutch piston (1) to induce friction between the plates
supported by the clutch hub and the plates supported by
the clutch basket on the differential carrier. This
frictional force inhibits the differential rotation;...

RH driveA
LH driveB
Battery Junction Box (BJB)1
Battery2
Engine Control Module (ECM)3
Transfer box control module4
The control module is connected to the Controller Area
Network (CAN) bus and controls the transfer box
operation using CAN messages from other control
modules on the network.
The control module memorises the position of the
transfer box motor when the ignition is switched off.
The transfer box control module uses the same actuator
to control both range change function and application
of...

range changing capability and graduated application of
locking torque appropriate for the current driving
conditions. Range change can be carried out while
moving providing the transmission is in neutral and the
vehicle is below the speed necessary for the requested
range change.
The control module uses three connectors for all inputs
and outputs. It receives a permanent power supply via
a 30A fusible link located in the Battery Junction Box
(BJB), and an ignition supply via fuse 24 in the Central...

If the system suffers a fault, which causes the transfer
box to fail in neutral, the control module is designed to
continue attempting to engage the requested range or
return to its original range for a fixed number of
attempts. If this has not been successful and the low
range lamp is still flashing the driver should bring the
vehicle to a halt and attempt the range change again
while stationary. If this does not work after a number
of attempts, key off for 30 seconds, restart engine and
request range...

Connector C1855
Input/outputDescriptionPin No.
InputHall sensor signal-A1
-Ground2
OutputHall sensors supply3
-Not used4
InputTemperature sensor5
InputHall sensor signal-B6
-Selector position ground7
Output5V position sensor supply8
-Selector mode solenoid ground9
InputSelector position sensor signal10
InputTransmission position sensor X axis signal11
OutputSelector mode solenoid power supply12
InputTransmission position sensor Y axis signal13
OutputManual transmission output shaft speed sensor
supply...

between the different control modules enabling more
sophisticated control with reduced complexity. Data on
the network is packaged for efficient communication
and prioritised according the urgency and importance
of the Messages. The bus comprises two wires, which
are twisted together to minimise electromagnetic
interference (noise) produced by the CAN messages.
The transfer box control module is connected on the
CAN bus and controls transfer box operation using CAN
messages from other control units on...

ratio calculated from the ratio of engine speed to
transmission output shaft speed. The transmission
learning is carried out at end of manufacture. If a new
transmission is fitted during the life of the vehicle the
learning algorithm needs to learn the characteristics of
the new transmission.
The instrument cluster displays the selected gear as
determined by the transfer box. The transfer box also
uses this to check the vehicle is in neutral before
attempting a range change.
Manual Transmission Output...