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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> LAN Communication System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U121C Can-HS SCU Data Abnormal >> Trouble Symptom

DTC U121C Can-HS SCU Data Abnormal: Trouble Symptom

Immobilizer does not operate normally.

DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK DTC. 
Using the Subaru Select Monitor, read all DTCs.		 Is there DTC other than CAN system? Perform the diagnosis according to DTCs for other control modules. Go to step 2  .
2 CHECK DTC. 
Check DTC indicated in CAN system.		 Is U121C a current malfunction? Go to step 3  . Go to step 4  .
3 CHECK DTC. 
Turn the ignition switch to OFF, and read the DTC again.		 Is U121C a current malfunction? Replace SCM. Refer to REMOVAL . Go to step 4  .
4 CHECK SCM. 
  1. Disconnect the connector from SCM.
  2. Using the Subaru Select Monitor, perform the clear memory.
  3. Using the Subaru Select Monitor, read DTC of CAN system.
 Is the displayed DTC other than U121C? Go to step 5  . Replace SCM. Refer to REMOVAL .
5 CHECK SCM. 
  1. Connect the SCM connector.
  2. Using the Subaru Select Monitor, read DTC of immobilizer. Refer to OPERATION .
 Is DTC other than CAN system displayed? Perform the diagnosis according to DTC. Replace the body integrated unit. Refer to REMOVAL .
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