- The TCCM performs the following functions:
| • | Processes the signal information |
| • | Develops output signals |
| • | Sends the output signal in order to control the shifting of the
transfer case |
- The TCCM receives input signals from the following sources:
| • | The transfer case select switch buttons |
| • | The park/neutral position (PNP) switch on the vehicles with automatic
transmissions |
| • | The clutch position switch on the vehicles with manual transmissions |
| • | The vehicle control module (VCM) that supplies the vehicle speed
signals |
| • | The motor/encoder that provides actual mode and range information
signals |
| • | The data link connector pin D3 that actuates diagnostic
enable |
| • | The front axle signal that indicates the axle status |
| • | Power (+12V for the module and motor supplies) |
| • | The ground used for return lines at the module |
- The TCCM outputs signals to the following components:
| • | Transfer case shift motor to initiate mode and range shifts |
| • | Transfer case select switch indicator lamps to provide transfer
case status information |
| • | Diagnostic DTCs which are output via the select switch indicator
lamps |
| • | Encoder power (+8V ref) for the encoder |
- In order to ensure the electronic shift system is operating properly,
the transfer case control module (TCCM) continually performs diagnostics checks
on itself and other parts of the electronic shift system when the ignition
switch is in the run position. The following are different types of system
checks that the TCCM continually performs.
