LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1254 (Transfer Case - NVG 246-NP8 (Two Speed Automatic)) >> Diagnostic Information and Procedures >> DTC C0310 >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  Listen for an audible motor noise when the encoder motor operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  Tests the for a higher than normal resistance in the Motor Control A and B circuits and through the module.
  3. 4:  Tests the Motor Feed A circuit for an open or high resistance.
  4. 5:  Tests the Motor Feed B circuit for an open or high resistance.
  5. 6:  Tests for continuity across the motor circuit.
DTC C0310

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. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With the scan tool, command the Motor A/B Feed ON and OFF.
Does the encoder motor turn ON and OFF?		 - Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems Go to Step 3 
3 
  1. Turn the ignition OFF.
  2. Disconnect the four wire connector at the transfer case.
  3. Connect a DMM between the Motor Control A and B circuit harness connector at the transfer case.
Is the resistance reading greater than the specified value?		 2 Ω Go to Step 4  Go to Step 6 
4 
  1. Disconnect the transfer case shift control module.
  2. Test the Motor Control A circuit harness connector for an open or high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 9  Go to Step 5 
5  Test the Motor Control B circuit harness connector for an open or high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Was the condition found and corrected?		 - Go to Step 9  Go to Step 8 
6  Test for continuity across the motor circuit.
Were the motor resistance values within the specified values?		 0.5-35 Ω Go to Step 8  Go to Step 7 
7 Replace the encoder motor. Refer to Transfer Case Motor/Encoder Replacement .
Is the repair complete?		 - Go to Step 9  -
8 Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .
Is the repair complete?		 - Go to Step 9  -
9
  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
scientia non olet · About LEMON Manuals