LR3/Disco 3
The transfer box control module receives a gear position signal from the manual transmission gear position sensor and
publishes the status on the CAN bus. This is displayed in the odometer display, similar to how the automatic transmission
displays gear information.
On vehicles fitted with the low line instrument cluster, in place of the message centre there will be a status lamp, which
has the following logic:
Amber - Over temperature
Red - Failure, stop vehicle
The following table shows the faults that could possibly illuminate the transfer box status lamp on vehicles fitted with the
low-line instrument cluster:
'SPEED TOO HIGH FOR RANGE
CHANGE'
Range change request when vehicle speed too high
Single
'SELECT NEUTRAL FOR RANGE
CHANGE'
Range change request when lever not in neutral
Single
'PARK LOCK FAILURE APPLY
HANDBRAKE' (PARKBRAKE
US/CAN)
This alerts the driver that the automatic transmission park lock
function is inoperative due to transfer box out of high or low range.
Transfer box control module has stopped transmitting on the CAN
bus during a range change or while in neutral mode and as a result
the automatic transmission park lock function is inoperative
One per
second for
three
seconds
'RANGE CHANGE INOPERABLE'
Transfer box has detected a fault inhibiting a new range change.
Control unit has shut down due to thermal overload
Single
'CENTRE DIFF OVER TEMP
REDUCE SPEED'
Centre differential temperature is approaching the over heated
threshold
Single
'CENTRE DIFF FAULT –
TRACTION REDUCED'
Centre differential has failed - operating as an open differential
Single
'CENTRE DIFF FAULT –
TRACTION REDUCED'
Transfer box control module has stopped transmitting on the CAN
bus and defaults to open centre differential
Single
Odometer Display
Description
N
Transmission is in neutral
1
Transmission is in first gear
2
Transmission is in second gear
3
Transmission is in third gear
4
Transmission is in forth gear
5
Transmission is in fifth gear
6
Transmission is in sixth gear
R
Transmission is in reverse gear (Japan only)
Blank display
Transmission is between neutral and a gear
E
Transmission gear position sensor has a fault
Indication
Description
OFF
Transfer box is operating at normal working temperature
YELLOW
WARNING LAMP
ON
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.
RED 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 failed with a non-zero locking torque
YELLOW
WARNING LAMP
Transfer box control module has stopped transmitting on the CAN bus and defaults to open centre
differential
