C0309

Circuit Description
The Transfer Case Motor is a bi-directional, permanent magnet, D.C motor. When energized, (through circuits 1552, 1553, and the ground circuit 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 circuits 1552 and 1553, or 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 Auto Transfer Case (ATC) Control Module senses a high voltage on circuits 1552 or 1553 when a low voltage is expected.


Action Taken When the DTC Sets
^ All shifting will be disabled.
^ The SERVICE indicator (4WD/AWD) lamp will be latched on for the remainder of the current ignition cycle.


Conditions for Clearing the DTC
^ The Auto Transfer Case (ATC) Control Module will clear the DTC it 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.






DTC C0309 Motor A/B Circuit High