C0327

DTC C0327

Circuit Description
The transfer case encoder is a switch that converts a shaft position, representing a mode or range position, into electrical signals for use by the transfer case shift control module. The encoder houses 4 hall effect sensors that are used for channels P, A, B, and C. These sensors provide a path to ground, when a magnet, which is part of the shift rail, passes over them.

The transfer case shift control module supplies an 8-volt reference and a ground circuit for the encoder hall effect sensors to function.
The transfer case shift control module supplies 5 volts on all the channels. As these channels are pulled to ground, the module can interpret the location of the transfer case shift position.

This DTC detects an open, short to ground, or a short to voltage in the encoder feed circuit, an open in the signal ground circuit, an open, short to ground, or short to voltage in the encoder channel circuits.

DTC Descriptor
This diagnostic procedure supports this DTC:
DTC C0327 Encoder Circuit Malfunction

Conditions for Running the DTC
^ The ignition is ON.
^ The system voltage is 9 - 16 volts.

Conditions for Setting the DTC
The transfer case shift control module reads back all high or low voltage on the encoder channel circuits.

Action Taken When the DTC Sets
^ The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.
^ All motor activity stops and the transfer case lock engages.
^ A default rail to rail shift may be allowed, toggle between 4H and 2H.

Conditions for Clearing the DTC
^ The transfer case shift control module clears the DTC if the condition for setting the DTC no longer exists.
^ A history DTC clears after 100 consecutive ignition cycles without a fault present.
^ History DTCs can be cleared using a scan tool.

Test Description

Steps 1-10:

These numbers correspond to the step numbers on the diagnostic table.
2. This step determines if the transfer case control module is supplying the correct 8-volt reference.
3. This step checks for proper voltage on the 4 encoder signal circuits.
4. This step tests for an open or high resistance on the encoder signal ground circuit.
5. This step tests the encoder signal circuits for an open, short to ground, or short to power.
6. This step checks for a binding sector shaft.
7. This step disassembles the transfer case and repairs for a binding sector shaft.