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. When energized, (through circuits 1552, 1553, and the ground circuit 1050 the module utilizes for motor control), the motor, through a series of gears, rotates a shaft which applies the internal clutch to transfer torque to the front wheels.

This DTC detects an open ground circuit 1050.

Conditions for Setting the DTC
The system test the motor circuits:
- First, the system checks for unwanted voltage.
- Then, the system supplies voltage on each of the motor circuits and reads the voltage back on the other circuit.
- After the system checks for opens and shorts on the motor circuits, its applies voltage to the motor and the voltage on the ground circuit.
- If the system detects a high voltage return on the ground circuit, the DTC is logged. The Automatic 4WD Transfer Case (ATC) Control Module senses a high voltage return on circuit 1050 (connector C2 terminal C) when a low 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 DTC
- The Auto 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.