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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Vehicle Dynamics Control (VDC) System (Diagnostics)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC C0051 Valve Relay >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK VDCCM&H/U INPUT VOLTAGE. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the VDCCM&H/U.
  3. Run the engine at idle.
  4. Measure the voltage between VDCCM&H/U connector and chassis ground.

    Connector & terminal 

    (B310) No. 28 (+) - Chassis ground (-): 

    (B310) No. 24 (+) - Chassis ground (-): 

 Is the voltage 10 - 15 V? Go to step 2  . Repair the power supply circuit.
2 CHECK VDCCM&H/U INPUT VOLTAGE. 
Calculate the voltage difference measured in step 1.
A: (B310) No. 28 (+) - Chassis ground (-): 
B: (B310) No. 24 (+) - Chassis ground (-): 		 Is the voltage difference between A and B 2 V or more? Repair the power supply circuit. Go to step 3  .
3 CHECK VDCCM&H/U GROUND CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between VDCCM&H/U connector and chassis ground.

    Connector & terminal 

    (B310) No. 25 - Chassis ground: 

 Is the resistance less than 10 Ω? Go to step 4  . Repair the VDCCM&H/U ground harness.
4 CHECK VDCCM&H/U VALVE RELAY. 
Measure the resistance between VDCCM&H/U terminals.
Terminals 
No. 24 - No. 25: 		 Is the resistance 1 MΩ or more? Go to step 5  . Replace the VDCCM&H/U. < Refer to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM& H/U) . >
5 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact of connector between generator, battery and VDCCM&H/U? Repair the connector. Go to step 6  .
6 CHECK VDCCM&H/U. 
  1. Connect all connectors.
  2. Clear the memory. < Refer to CLEAR MEMORY MODE . >
  3. Perform the Inspection Mode. < Refer to INSPECTION MODE . >
  4. Read the DTC.
 Is the same DTC displayed? Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). > Go to step 7  .
7 CHECK OTHER DTC DETECTION.  Is any other DTC displayed? Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Temporary poor contact occurs.
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