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 250. 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 an open on circuits 1552 and 1553, an open motor.

Conditions for Setting the DTC
- The system will test the motor circuits by checking for unwanted voltage.
- Then, the system supplies voltage on each of the motor circuits and reads the voltage back on the other circuit.
- 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 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.