C0309

Circuit Description
The transfer case motor is a bi-directional, permanent magnet, DC motor. When energized, (through CKT 1552, 1553, and the ground CKT 2150, 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, Adapt, 2H, N, and 4L ranges.
This DTC detects a short to Voltage on CKTS 1552 and 1553, a shorted motor.
Conditions for Setting the DTC
^ The system will test the motor circuits by reading the voltage on each circuit.
^ If the system detects a problem with the circuits, the DTC is logged.
^ The transfer case shift control module senses a high voltage on CKTS 1552 or 1553 when a low voltage is expected.
Action Taken When the DTC Sets
^ All shifting will be disabled.
^ The SERVICE indicator (AWD/4WD) 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.
2. This step determines if there is a short to voltage on circuit 1552.