C0310

Circuit Description
The transfer case motor is a bi-directional, permanent magnet, DC motor. When energized, (through CKTS 1552, 1553, and the ground CKT 150, the module utilize for motor control), the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between 4H, AUTO (Adapt), 2H, N, and 4L ranges.
This DTC detects an open on CKTS 1552 and 1553, an open motor.
Conditions for Setting the DTC
^ The system will test the motor circuits by checking for unwanted voltage.
^ The system supplies voltage on each of the motor circuits and reads the voltage back on the other circuit.
^ If the system detects a problem with the circuits, the DTC is logged. The transfer case shift control module senses a low voltage return on CKTS 1552 or 1553 when a high voltage is expected.
Action Taken When the DTC Sets
^ All shifting will be disabled.
^ The SERVICE indicator (AWDAWID) lamp will be latched on for the remainder of the current ignition cycle.
Conditions for Clearing the DTC
^ The transfer case shift control module will clear the DTC if the condition for setting the DTC no longer exists.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ History DTCs can be cleared using a scan tool.





Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
4. This step determines if circuit 1552 is open.
5. This step determines if circuit 1553 is open.