C0327
DTC C0327Circuit Description
The transfer case encoder is an analog sensor that returns a signal that represents the physical position of the transfer case sector shaft. This signal represents the mode or range position that the transfer case is currently in. This sensor is made up of the following 3 circuits:
^ A 5-volt reference circuit
^ An encoder signal circuit
^ An encoder return circuit
This DTC detects an out-of-range reading from the encoder signal, a short-to-voltage on the 5-volt regulator, encoder circuit.
Conditions for Setting the DTC
The transfer case shift control module has a predefined range in which the encoder feed back should stay within 0.5 - 4.5 volts. The DTC will set if the encoder signal feed back falls out of this range.
Action Taken When the DTC Sets
^ All motor activity will stop and the transfer case lock will engage.
^ 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 100 consecutive ignition cycles without a fault present.
^ History DTCs can be cleared using a scan tool.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests the encoder circuit for a current malfunction.
3. Tests for an internal encoder malfunction which is present only in certain areas of the encoder sensor.
4. Tests for proper reference voltage at the encoder.
5. Tests the 5-volt regulator encoder circuit for a short-to-voltage, short-to-ground, an open or high resistance.
6. After determining that the reference voltage measured in Step 4 was correct, Step 6 reviews the reading originally measured in Step 3 was higher or lower than what should have been expected. This step helps determine whether the encoder signal circuit is being pulled high or low.
7. Tests the encoder signal circuit and the encoder return circuit for a short-to-voltage.
8. Helps determine a faulty encoder.
9. Tests the encoder signal circuit and the encoder return circuit for an open or a short-to-ground.
DTC C0327 (1 Of 3):
DTC C0327 (2 Of 3):
DTC C0327 (3 Of 3):
