Transfer Box Control Module
The transfer box control module controls the high/low 'shift-on-the-move' actuation and the multi-plate clutch actuation. The control module is located in the E-box, next to the Engine Control Module (ECM), behind the battery in the engine compartment. The position of the control module changes with LH and RH drive vehicles.
| ITEM | DESCRIPTION |
|---|---|
| A | RH drive |
| B | LH drive |
| 1 | Battery Junction Box (BJB) |
| 2 | Battery |
| 3 | Engine Control Module (ECM) |
| 4 | Transfer box control module |
The control module is connected to the Controller Area Network (CAN) bus and controls the transfer box operation using CAN messages from other control modules on the network.
The control module memorizes the position of the transfer box motor when the ignition is switched off.
The transfer box control module uses the same actuator to control both range change function and application of center differential locking torque. The module uses position feed back from the actuator to provide smooth range changing capability and graduated application of locking torque appropriate for the current driving conditions. Range change can be carried out while moving providing the transmission is in neutral and the vehicle is below the speed necessary for the requested range change.
The control module uses three connectors for all inputs and outputs. It receives a permanent power supply via a 30A fusible link located in the Battery Junction Box (BJB), and an ignition supply via fuse 24 in the Central Junction Box (CJB).
The control module uses a series of programmed shift maps to control the synchronization speed and ensure that a maximum shift time of approximately one second is achieved.
If the control module is replaced, T4 must be connected to the vehicle and the transfer box control module self-calibration procedure must be performed. This procedure must also be performed if the transfer box motor assembly is replaced.
DEFAULT/LIMP-HOME STRATEGY
If a fault occurs with the transfer box, the transfer box control module or one of the required input signals i.e. road speed signal, the control module records an error code and will respond appropriately to provide the highest level of system capability under the specific fault conditions. The following fault states are possible:
| FAULT STATE | SYSTEM RESPONSE | DRIVER WARNING |
|---|---|---|
| No reduction in capability | Diagnostic Trouble Code (DTC) will be recorded but no effect on performance | Non |
| Clutch control not possible. Temporary over temperature condition | The tractive capability of the vehicle, off road, is reduced. | Driveline over temperature warning lamp or "CENTRE DIFF OVER TEMP REDUCE SPEED" on message center |
| Clutch control not possible. Permanent fault | The tractive capability of the vehicle, off road, is reduced. | Driveline fault warning lamp or "CENTRE DIFF FAULT TRACTION REDUCED" on message center |
| Range change not possible | The system inhibits the driver from making a range change | Driveline fault warning lamp or "TRANSMISSION RANGE CHANGE NOT AVAILABLE" on message center |
| Stuck in Transfer box neutral | The transfer box is stuck between high and low range resulting in no drive to wheels | Flash low range indicator plus "APPLY HANDBRAKE (PARK BRAKE in USA and Canada)". The message will only display at times when it is deemed safe or necessary. It will not display during normal driving for example. |
If a driveline over temperature condition has occurred, after the driveline has been allowed to cool, clutch control will be re-enabled and the warnings will disappear. There is no need to seek service assistance following an over temperature event.
If clutch control or Range change is not possible due to a permanent fault the driver must seek service assistance at the earliest opportunity.
If the system suffers a fault, which causes the transfer box to fail in neutral, the control module is designed to continue attempting to engage the requested range or return to its original range for a fixed number of attempts. If this has not been successful and the low range lamp is still flashing the driver should bring the vehicle to a halt and attempt the range change again while stationary. If this does not work after a number of attempts, key off for 30 seconds, restart engine and request range change again while stationary. The driver must seek service assistance at the earliest opportunity.
TRANSFER BOX CONTROL MODULE PIN OUT DETAILS
Connector 1-C1319
| PIN NO. | DESCRIPTION | INPUT/OUTPUT |
|---|---|---|
| 1 | Not used | - |
| 2 | Not used | - |
| 3 | CAN bus low | Data (input and output) |
| 4 | Range change selection switch - High | Input |
| 5 | Range change selection switch - Low | Input |
| 6 | CAN bus high | Data (input and output) |
| 7 | Key interlock solenoid | Output |
| 8 | LED-high | Output |
| 9 | LED-low | Output |
Connector 2-C1854
| PIN NO. | DESCRIPTION | INPUT/OUTPUT |
|---|---|---|
| 1 | CAN bus low | Data (input and output) |
| 2 | Not used | - |
| 3 | Ignition power supply | Input |
| 4 | CAN bus high | Data (input and output) |
| 5 | Ground | - |
| 6 | Permanent battery power supply | Input |
Connector 3-C1855
| PIN NO. | DESCRIPTION | INPUT/OUTPUT |
|---|---|---|
| 1 | Hall sensor signal-A (directional) | Input |
| 2 | Hall sensor ground | - |
| 3 | Hall sensors supply | Output |
| 4 | Not used | - |
| 5 | Temperature sensor | Input |
| 6 | Hall sensor signal-B (speed) | Input |
| 7 | Selector position ground | - |
| 8 | 5V position sensor supply | Output |
| 9 | Selector mode solenoid ground | - |
| 10 | Selector position sensor signal | Input |
| 11 | Transmission position sensor X axis signal | Input |
| 12 | Selector mode solenoid power supply | Output |
| 13 | Transmission position sensor Y axis signal | Input |
| 14 | Manual transmission output shaft speed sensor supply | Output |
| 15 | Motor supply/ground | Input/output |
| 16 | Manual transmission output shaft speed signal | Input |
| 17 | Manual transmission output shaft speed sensor ground | - |
| 18 | Motor supply/ground | Input/output |