NVG 233-NP1 2 Speed Automatic 4WD Transfer Case

Diagnostic Chart:

Wiring Diagram:

Circuit Description
The Rear Propshaft Speed Sensor is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases. The module converts the pulsating AC voltage to a Propshaft RPM which is used for calculations. The RPM can be displayed with a scan tool.

This DTC detects an open, short to ground, or faulty sensor.

Conditions for Setting the DTC
The system will log the DTC if the rear speed sensor input indicates a speed of less than 16 RPM for 30 seconds while all of the following are true:
- Transmission NOT in Park/Neutral
- Engine is running
- Front speed sensor exceeds 512 RPM
- Vehicle Speed On Class 2 Data bus exceeds 10 mph

Action Taken When the DTC Sets
The system will not allow any further adaptive events (correct slip). 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.

Diagnostic Aids
- A scan tool will show the position of the park switch.
- The state of the park switch is ON or OFF.
- An intermittent problem may be caused by a poor connection, break in the wire insulation exposing the internal wire, or a wire that is broken inside the insulation.