Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

Range Change Selection Switch
The range change selection switch in located behind the
main transmission selection lever, in the centre console.
The switch is a 3-position momentary action centre
sprung device. The driver pushes the lever forward to
select high range and back to select low range.
The switch comprises a housing, which provides the
location for a sliding contact. When the switch is moved
to the high or low position, it completes a momentary
connection to 12V with one of two micro-switches...

CAN Bus Messages
The control module also sends messages via the CAN
bus to tell other control modules on the network, the
status of the transfer box. The high/low status, clutch
torque and default mode status are some of the main
signals sent out by the transfer box control module.
Key Interlock Solenoid
The transfer box control module is able to send a signal
to the key interlock solenoid. This signal locks the key
in the ignition barrel to prevent it from being removed
if the automatic transmission is...

SolenoidThe solenoid switches the power flow on the actuation
system between high/low range change mode and clutch
control mode. When the solenoid is energized, the
solenoid pin deploys and activates the clutch control
mode. When the solenoid is de-energized, the internal
spring rejects the solenoid pin and activates the high/low
range change mode.
NOTE: In order to replace the solenoid in service, the
solenoid must be energized using the diagnostic tool.
The solenoid is connected to the transfer box...

On vehicles fitted with the high line instrument cluster
there will be one low range status indicator. This
indicator will take the form of a mountain symbol and
has the following logic:
•Lamp on = low range
•Lamp off = high range
•Lamp flashing = range change in progress/range
undefined/range fault.
There will also be a message displayed in the message
centre, on vehicles with high-line instrument cluster,
which will inform the driver of any faults with the
transfer box.
The following table shows the...

ChimeDescriptionMessage
SingleCentre differential temperature is
approaching the over heated
threshold
CENTRE DIFF OVER TEMP
REDUCE SPEED
SingleCentre differential has failed - oper-
ating as an open differential
CENTRE DIFF FAULT – TRAC-
TION REDUCED
SingleTransfer box control module has
stopped transmitting on the CAN bus
and defaults to open centre differen-
tial
CENTRE DIFF FAULT – TRAC-
TION REDUCED
The transfer box control module receives a gear position
signal from the manual transmission gear...

DescriptionIndication
Transfer box is operating at normal working temperatureOFF
Transfer box temperature is approaching the over heated
threshold
YELLOW WARNING LAMP ON
Transfer box has detected a fault, which affects the range
change function (current range is still maintained) or the
centre differential has failed to open.
YELLOW WARNING LAMP ON
Transfer box has detected a fault which renders the
transmission park lock function inoperative due to out
of range condition, OR centre differential has...

The transfer box weighs 40.30 kg without oil and 41.55
kg with oil. The unit requires 1500 ml ± 2% of oil from
empty.
The oil used in the transfer box is Shell TF 0753, which
has been specially developed by Magna Steyr and Shell.
The oil contains unique additives, which enhance the
transfer box operation. No other oil must be used in the
transfer box.
There is a unique type of grease, Weicon anti-seize
montagepaste grau TL 7391, that needs to be applied
the units input shaft spline when installing or...

Perform a range change to low range. Wait 30
seconds while the first calibration of the clutch in
low range is done. While this calibration process is
in progress, no shifting is accepted
Switch ignition off and wait 15 seconds
Range and clutch calibration is now complete.
Manual Transmission Gear Learning Process
The transfer box control module must learn the
characteristics of the manual transmission to which it
is connected to be able to correctly recognise which
gear the driver has selected.
This...

display HIGH RANGE for approximately 3 seconds
followed by a chime from the instrument cluster to
confirm that the range change has been completed.
The design of the transfer box allows range changes
when the vehicle is moving, within set limitations as
follows:
•High to Low – at speeds not exceeding 25 mph (40
km/h) for vehicles with automatic transmission, and
12 mph (20 km/h) for vehicles with manual
transmission
•Low to High – at speeds not exceeding 37 mph (60
km/h).
If the vehicle speed is higher...

HIGH RANGE OPERATION
In high range, the torque input from the transmission is
passed to the transfer box input shaft. The position of
the synchroniser sleeve couples the shaft directly to the
differential housing. The differential splits the torque
between the two side gears. One side gear is connected
by splines and passes the torque to the rear output flange.
The second side gear is connected to the chain drive
sprocket and passes the torque, via the chain, to the front
output flange.
LOW RANGE...