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Test Description

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

  1. 2:  Tests to see if the malfunction is intermittent.
  2. 3:  Tests the internal resistance of the propshaft speed sensor.
  3. 4:  Tests to see if the propshaft speed sensor can generate a sufficient amount of AC voltage.
  4. 5:  Tests the RSS LO circuit for a short to ground, a high resistance, or an open.
  5. 6:  Tests the RSS HI circuit for a short to ground, a high resistance, or an open.
  6. 7:  Tests the RSS HI circuit for a short to voltage.
  7. 8:  Tests the RSS LO circuit for a short to voltage.
  8. 9:  Tests the RSS HI circuit for a short to the RSS LO circuit.
DTC C0300

Step Action Value(s) Yes No
Schematic Reference:  Transfer Case Control Schematics  
1 Was the Transfer Case Diagnostic System Check performed? - Go to Step 2  Go to Diagnostic System Check - Transfer Case 
2 
  1. Drive the vehicle for a short test drive.
  2. With the scan tool, observe the value of the Rear Propshaft Speed data parameter in the Transfer Case data list while driving.
Does the rpm value vary while driving?		 - Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 
  1. Turn the ignition OFF.
  2. Disconnect the transfer case rear propshaft speed sensor.
  3. Measure the resistance of the transfer case rear propshaft speed sensor.
Is the resistance reading within the specified values?		 1300-2700 Ω Go to Step 4  Go to Step 10 
4 
  1. Connect a DMM to the transfer case rear propshaft speed sensor.
  2. Raise the vehicle on a hoist so that the wheels turn freely.
  3. Start the vehicle and put it into drive.
  4. Accelerate slowly to 3 kph (5 mph).
  5. Observe the AC voltage reading on the DMM.
Is the voltage reading greater than the specified value?		 0.5-3.5 V AC Go to Step 5  Go to Step 10 
5 
  1. Disconnect the transfer case shift control module.
  2. Test the RSS LO circuit for a short to ground, a high resistance, or an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 12  Go to Step 6 
6  Test the RSS HI circuit for a short to ground, a high resistance, or an open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 12  Go to Step 7 
7  Test the RSS HI circuit for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 12  Go to Step 8 
8  Test the RSS LO circuit for a short to voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 12  Go to Step 9 
9  Test the RSS HI circuit for a short to the RSS LO circuit. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 12  Go to Step 11 
10 Replace the transfer case rear propshaft speed sensor. Refer to Transfer Case Speed Sensor Replacement (Front)  or Transfer Case Speed Sensor Replacement (Right Rear)  or Transfer Case Speed Sensor Replacement (Left Rear) .
Is the repair complete?		 - Go to Step 12  -
11 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Is the repair complete?		 - Go to Step 12  -
12
  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 reset?		 - Go to Step 2  System OK
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