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DTC U0122: Lost Communication With Vehicle Dynamics Control Module

DTC DETECTING CONDITION: 

No data from VDCCM is received.

TROUBLE SYMPTOM: 

ABS warning light and VDC warning light illuminate.

Step Check Yes No
1 CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE  . Was the basic diagnostic procedure performed up to STEP 3? Go to step 2  . Perform the basic diagnostic procedure. Ref. to BASIC DIAGNOSTIC PROCEDURE .
2 CHECK DTC  .
Check the displayed DTC.		 Are DTCs other than U*** displayed? Perform the diagnosis according to DTC. Go to step 3  .
3 CHECK DTC  .
Check the displayed DTC.		 Is U0122 a current malfunction? Go to step 4  . Go to step 8  .
4 CHECK DTC  .
  1. Check CAN communication circuit. Ref. to CAN COMMUNICATION CIRCUIT CHECK .
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0122 a current malfunction? Go to step 5  . Go to step 8  .
5 CHECK DTC  .
Using the Subaru Select Monitor, read DTC of all the systems. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .		 Is the VDC data no-receive detected in several modules? Replace the VDC Control Module. Ref. to VDC Control Module and Hydraulic Control Unit (VDCCM & H/U) . Go to step 6  .
6 REPLACE MODULE  .
  1. Replace the VDC Control Module.
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0122 a current malfunction? Go to step 7  . System is normal.
7 CHECK MODULE  .
  1. Reinstall the VDC Control Module.
  2. Replace the module that the DTC has been detected.
  3. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0122 a current malfunction? Replace the VDC Control Module. Ref. to VDC Control Module and Hydraulic Control Unit (VDCCM & H/U) . System is normal.
8 CHECK HARNESS  .
  1. Shake the harness, and check for poor contact.
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0122 a current malfunction? Repair the poor contact of harness, or replace the harness. Go to step 9  .
9 CHECK CONNECTOR  .
Check the connector used for high speed CAN for poor contact.		 Is there poor contact of connector? Repair the connector that has poor contact, or replace harness. It is possible that temporary poor communication occurs. Delete the DTC.
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