C0327

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2 Of 2:

DTC C0327 Encoder Circuit Malfunction
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, (part of the shift rail), passes over them.
The transfer case shift control module supplies an 8 V reference and a ground circuit for the encoder hall effect sensors to function via CKT 431 and 1554 respectfully.
The transfer case shift control module supplies 5 V on all of the channels, thus 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 (12 V) in CKT 431, an open in CKT 1554, an open, short to ground, or short to voltage (12 V) in the encoder channel CKTS 1555, 1557, 1558, or 1556.
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
^ All motor activity will stop and the transfer case lock engaged.
^ A default rail to rail shift may be allowed, (toggle between 4H and 2H).
^ The SERVICE indicator (AWD/4WD) lamp 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 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.
Test Description
The number(s) refer to the step number(s) on the diagnostic table.
2. This test will help to isolate whether or not the fault exits in the transfer case motor encoder.
3. This test will determine if the suspect encoder circuit is shorted to ground.
6. This test will help determine if one or more encoder channels are shorted together.
8. This test will determine if the suspect encoder circuit is open.
14. This test determines if CKT 431 is shorted to power.