NVG 233-NP1 2 Speed Automatic 4WD Transfer Case

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The Transfer Case Motor is a bi-directional, permanent magnet, D.C. motor. The motor is energized through circuits 1552, 1553, and the ground circuit 250 that the module utilizes for motor control. The motor, through a series of gears, rotates the shaft which applies the internal clutch to transfer torque to the front wheels.

This DTC detects a short to ground on circuits 1552 and 1553, or a shorted motor.

Conditions for Setting the DTC
- The system will test the motor circuits:
- First, the system checks for unwanted voltage.
- Then, the system supplies voltage on one circuit and reads the voltage back on the other.
- If the system detects a problem with the circuits, the DTC is logged.
- The Automatic 4WD Transfer Case (ATC) Control Module senses a low voltage return on circuits 1552 or 1553 when a high voltage is expected.

Action Taken When the DTC Sets
- All clutch activation (slip control) will be disabled.
- The service 4WD lamp will be latched on for the remainder of the current ignition cycle.

Conditions for Clearing the MIL/DTC
- The Automatic 4WD Transfer Case (ATC) 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.