Transfer Case Control Module
| ITEM | DESCRIPTION |
|---|---|
| 1 | TCCM |
The TCCM comprises an integrated control module and a brushless Direct Current (DC) motor. The TCCM is installed 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 module (multiplate clutch).
The TCCM detects wheel slip and other vehicle conditions through 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. The TCCM 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 through 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 installed within TCCM .
The actuation shaft rotational movement is monitored by a high/low range position sensor installed 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 Modulated (PWM) signal to the TCCM through hardwired connection.
The TCCM is connected to the FlexRay and controls transfer case operation. The TCCM receives a power supply through a relay from:
- A 30A 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 (BCM)/Gateway Control Module (GWM).
When the TCCM is replaced, the JLR 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