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.