Hi All,

I've had a transfer box failure. Now.my question is do these really.need calibration when changed?

TIA

Yes, they do

What sort of damage can we cause if we don't calibrate them? I've switched my module out about 6 months ago and it "seems" to be running fine. Genuine question am I doing untold damage?

It was a used part out of an RRS 07. 2007 RRS 2.7 HSE - Java Black

I doubt it would cost much to get a suitable LR specialist to do the calibration for you. At least you know it's been done.

As the transfer control module is separate from the transfer box, and the transfer box has sensors telling it whether it is in high or low and the position (and temperature) of the actuator motor, the calibration will ensure that the control module knows what the sensors are saying - "here I am in high", "here I am in low", "here is me locking the diff 100%", etc.

From the workshop manual:

Quote:

Clutch and Range Change Mechanism Calibration
In order for the range change mechanism to function correctly, the transfer box control module must be calibrated to the mechanical dimensions of the transfer box that it is connected to.

This procedure will need to be followed if one of the following occurs:
The vehicle is first assembled
The switch is changed
The transfer box control module is changed
The transfer box or range position sensor is changed
Vehicle or transfer box control module fault has caused the transfer box to revert to an undefined range.

Calibration can be carried out using the service tool or by following this procedure:

Switch ignition to position II without the engine running
Select neutral
Depress the throttle pedal fully
Press and hold the range change switch for 5 or more seconds to allow calibration to start
When the calibration is heard to start, the switch and throttle pedal can be released
Upon adopting high range, start the engine and wait 30 seconds while the first calibration of the clutch in high range is
done. While this calibration process is in progress, no shifting is accepted
Switch ignition off and wait 15 seconds
Start engine
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.

Thanks for that info. Might give that workshop guide a go tomorrow, failing that she's due her mot soon so I'll get it looked at then. 2007 RRS 2.7 HSE - Java Black