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Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step checks for a voltage reading on the scan tool.
  2. 3:  This step tests the encoder circuit for a current malfunction.
  3. 4:  This step tests for an internal encoder malfunction which is present only in certain areas of the encoder sensor.
  4. 5:  This step tests for proper reference voltage at the encoder.
  5. 6:  This step tests the 5-volt regulator encoder circuit for a short to voltage, short to ground, an open or high resistance.
  6. 7:  After determining if the reference voltage measured in Step 4 is correct, Step 6 reviews the reading originally measured in Step 3 to see if it is higher or lower than what is expected. This step helps determine whether the encoder signal circuit is being pulled high or low.
  7. 8:  This step tests the encoder signal circuit and the encoder low reference circuit for a short to voltage.
  8. 9:  This step helps determine a faulty encoder.
  9. 10:  This step tests the encoder signal circuit and the encoder low reference circuit for an open or a short to ground.
DTC C0327

Step Action Values Yes No
Schematic Reference:  Transfer Case Control Schematics  
Connector End View Reference:  Transfer Case Control Connector End Views  
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Turn the ignition ON with the engine OFF.
  3. With a scan tool, observe the Encoder supply and return voltage parameters.
Are the voltage parameters displayed?		 - Go to Step 3  Go to Step 5 
3 
  1. Install a scan tool.
  2. Start the engine.
  3. Set the park brake.
  4. Place the transmission in Neutral.
  5. With a scan tool, observe the Encoder Return Voltage parameter.
  6. Select each of the mode positions.
Does the voltage reading stay within the specified values?		 0.5-4.5 V Go to Testing for Intermittent Conditions and Poor Connections Go to Step 4 
4  Does the voltage reading stay within the specified values at any position? 0.5-4.5 V Go to Step 11  Go to Step 5 
5 
  1. Turn the ignition OFF.
  2. Disconnect the encoder motor.
  3. Turn the ignition ON with the engine OFF.
  4. Measure the voltage from the 5-volt reference encoder circuit to ground at the transfer case shift control module side of the harness.
Does the voltage measure within the specified values?		 4.8-5.2 V Go to Step 7  Go to Step 6 
6  Test the 5-volt reference encoder circuit for a short to voltage, a short to ground, an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
7  Was the voltage reading measured in Step 4 greater than 5.2 volts? - Go to Step 8  Go to Step 9 
8  Test the encoder signal circuit and the encoder low reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
9 
  1. Install a scan tool.
  2. Turn the ignition ON with the engine OFF.
  3. Using a fused jumper, back probe between the 5-volt reference encoder circuit and encoder signal circuit at the transfer case shift control module side of the harness.
  4. With a scan tool, observe the Encoder Return Voltage parameter.
Is the encoder return voltage display within the specified values?		 4.8-5.2 V Go to Step 11  Go to Step 10 
10  Test the encoder signal circuit and the encoder low reference circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
11 Replace the encoder sensor. Refer to Encoder Motor Sensor Replacement . Perform the Clutch Reset Procedure. Refer to Transfer Case High/Low Clutch Reset .
Did you complete the repair?		 - Go to Step 13  -
12 Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming. Perform the Clutch Reset Procedure. Refer to Transfer Case High/Low Clutch Reset .
Did you complete the repair?		 - Go to Step 13  -
13
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC set?		 - Go to Step 2  System OK
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