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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 C0044 TCM Communication Circuit >> 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 LAN SYSTEM. 
Perform the diagnosis for LAN system. < Refer to BASIC DIAGNOSTIC PROCEDURE . >		 Is there any fault in LAN system? Perform the diagnosis according to DTC for LAN system. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Go to step 2  .
2 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact of TCM connector? Repair the connector. Go to step 3  .
3 CHECK TCM. 
Refer to the basic diagnostic procedure for Automatic Transmission (diagnostics).		 Is the TCM normal? Go to step 4  . Replace the TCM. < Refer to TRANSMISSION CONTROL MODULE (TCM) . >
4 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 5  .
5 CHECK OTHER DTC DETECTION.  Is any other DTC displayed? Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > It results from a temporary noise interference.
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