NVG 246-NP8 (Two Speed Automatic)

DTC C0374

Test 1-3:

Test 4-11:

Circuit Description
The transfer case shift control module senses rear slip. After several attempts of applying torque to the front wheels, by activating the encoder motor, the transfer case still sees a difference in speed between the front propshaft speed sensor and rear propshaft speed sensor.

Conditions for Running the DTC
^ The ignition is ON.
^ System voltage is 9-18 volts.

Conditions for Setting the DTC
The transfer case shift control module is unable to correct sensed wheel slip for 10 consecutive seconds.

Action Taken When the DTC Sets
^ All shifts to Auto Mode are disabled. If the current mode is Auto, the system will not allow any further adaptive events, such as correcting slip.
^ The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

Conditions for Clearing the DTC
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ Use a scan tool in order to clear history and current DTCs.

Diagnostic Aids
If DTCs C0300 or C0305 have set, diagnose these DTCs first as they may cause DTC C0374 to set falsely.

Test Description
The numbers refer to the step numbers on the diagnostic table.
2. This step determines if the rear propshaft speed sensor and wiring are operating properly.
3. This step determines if the front propshaft speed sensor and wiring are operating properly.
4. This step determines if the motor control A or motor control B circuits are shorted to ground within the encoder motor.
5. This step tests the integrity of the motor windings.
6. This step tests the motor control A and motor control B circuits for an open, short to ground, or high resistance between the encoder motor and the transfer case shift control module.
7. This step determines whether the transfer case is mechanically functioning properly.