C0359

DTC C0359

CIRCUIT DESCRIPTION
The 4WD low signal 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 4W0 low range. This DTC detects a short to ground, short to voltage, or an open in the 4WD low signal circuit.

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The system voltage is 9-18 volts.

CONDITIONS FOR SETTING THE DTC
- After the transfer case shift control module grounds the output, the 4WD Low signal circuit, and reads back a high voltage, the DTC is set. The system will not attempt setting the DTC again during that ignition cycle.
- The transfer case shift control module reads back a high voltage when a low voltage is expected on the 4WD low signal circuit.

ACTION TAKEN WHEN THE DTC SETS
- Transmission shift points may be affected.
- The SERVICE 4WD indicator will be latched on 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 33 consecutive ignition cycles without a fault present.
- History DTCs can be cleared using a scan tool.

TEST DESCRIPTION

Steps 1-8:

The numbers below 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 low signal circuit.
3. This step tests the 4W0 low signal circuit for a short to voltage.
4. This step tests the 4WD low signal circuit for an open or high resistance.
5. This step repairs the 4WD low signal circuit for a short to voltage.