Transfer Case Control Module With Integrated Actuator

Transfer Case Control Module (TCCM) comprises an integrated control module and a brushless Direct Current (DC) motor. The TCCM is fitted to the twin speed transfer case. The integrated transfer case motor is controlled by the TCCM to operate both the high/low range change and the torque-biasing device (multiplate clutch).

The TCCM detects wheel slip and other vehicle conditions via various inputs from other control modules. The TCCM controls the multiplate clutch based on these inputs to provide optimal torque distribution to the front differential and rear differential. It also receives range change requests from the range change selection switch and controls high/low gear change. The multiple clutch control and range change actuation are achieved by the integrated transfer case motor via a worm gear which drives an actuation shaft. The TCCM monitors the rotational position of the integrated transfer case motor by a Hall effect sensor fitted within TCCM.

The actuation shaft rotational movement is monitored by a high/low range position sensor fitted in the transfer case. The electrical power and ground to the high/low range position sensor is provided by TCCM. The high/low range position sensor sends a Pulse Width Modulation (PWM) signal to the TCCM via hardwired connection.

The TCCM is connected to the FlexRay bus and controls transfer case operation. The TCCM receives a power supply via a relay from:

• A 40A fuse link located in the Engine Junction Box (EJB)
• The power supply relay is controlled by the relay - extended ignition which is controlled by Body Control Module/Gateway Module (BCM/GWM) assembly.

If the TCCM is replaced, the Land Rover approved diagnostic system must be connected to the vehicle and the "New Module Replacement" procedure must be completed.

For additional information, refer to: TRANSFER CASE