Transfer Case - Diagnosis - New Venture 233 (SELECTABLE 4WD): Operation

TCCM receives input signals, processes signal information, develops output signals and sends output signal to control transfer case shifting. Input signals to TCCM are received from transfer case shift select buttons, neutral safety backup switch (A/T), clutch safety switch (M/T), vehicle speed sensor calibrator module, motor/encoder range and mode feedback signals, diagnostic enable signal, and front axle mechanical status signal.

To ensure electronic shift system is operating properly, TCCM continually performs diagnostic checks on itself and other parts of shift system whenever ignition is on.