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DTC U0420: Invalid Data Received From Power Steering Control Module

DTC DETECTING CONDITION: 

Defective data was transmitted from EPS Control Module.

TROUBLE SYMPTOM: 

Cooperation control with EPS Control Module does not operate properly.

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 DTC for the bus off or the data no-receive displayed? Perform the diagnosis according to DTC. Go to step 4  .
4 CHECK DTC  .
Check the displayed DTC.		 Is U0420 a current malfunction? Go to step 5  . Go to step 9  .
5 CHECK DTC  .
  1. Turn the ignition switch to OFF.
  2. Disconnect the power steering Control Module connector.
  3. Connect the disconnected connectors.
  4. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0420 a current malfunction? Go to step 6  . Go to step 9  .
6 CHECK DTC  .
Using the Subaru Select Monitor, read DTC of all the systems. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .		 Is the electric power steering data abnormal detected in several modules? Replace the power steering Control Module. Ref. to Power Steering Control Module . Go to step 7  .
7 REPLACE MODULE  .
  1. Replace the power steering Control Module.
  2. Read the DTC using Subaru Select Monitor.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0420 a current malfunction? Go to step 8  . System is normal.
8 CHECK MODULE  .
  1. Reinstall the power steering 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 U0420 a current malfunction? Replace the power steering Control Module. Ref. to Power Steering Control Module . System is normal.
9 CHECK HARNESS  .
  1. Shake the harness, and check for poor contact.
  2. Using the Subaru Select Monitor, read DTC of CAN system.

    Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .

 Is U0420 a current malfunction? Repair the poor contact of harness, or replace the harness. Go to step 10  .
10 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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