NVG 246-NP8 Transfer Case

DTC C0359

Test 1-3:

Test 4-8:

Circuit Description
The 4WD LO circuit is used to notify the powertrain control module (PCM) that the vehicle is in 4WD low range. The PCM supplies 12 volts to this circuit. The transfer case shift control module grounds this circuit when the vehicle is in 4WD low range.

This DTC detects a short to ground, short to voltage, or an open in the 4WD LO circuit.

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

Conditions for Setting the DTC
^ After the transfer case shift control module grounds the output, the 4WD LO circuit, and reads back a high voltage, the DTC is set. The system will not attempt setting the DTC again for 5 seconds.
^ The transfer case shift control module reads back a high voltage when a low voltage is expected on the 4WD LO circuit.

Action Taken When the DTC Sets
^ Transmission shift points may be affected.
^ The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

Conditions for Clearing the DTC
^ The transfer case shift control module will clear the DTC if the condition for setting the DTC is not currently present.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ History DTCs can be cleared using a scan tool.

Test Description
The numbers refer to the step numbers on the diagnostic table.
2. This step tests for proper reference voltage to the transfer case shift control module on the 4WD LO circuit.
3. This step tests the 4WD low circuit for a short to voltage.
4. This step tests the 4WD low circuit for an open or high resistance.
5. This step repairs the 4WD low circuit for a short to voltage