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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 U1201 Can-HS Counter Abnormal >> Trouble Symptom

DTC U1201 Can-HS Counter Abnormal: Trouble Symptom

DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK CAN COMMUNICATION CIRCUIT. 
Check CAN communication circuit. Refer to PROCEDURE .		 Is CAN communication circuit faulty? Repair the faulty portion, following the diagnosis procedure. Go to step 2  .
2 CHECK DTC. 
  1. Start the engine.
  2. Using the Subaru Select Monitor, read DTC of CAN system.
 Is U1202 a current malfunction? Perform the diagnosis of U1202. Refer to DTC U1201 CAN-HS COUNTER ABNORMAL . Go to step 3  .
3 CHECK DTC. 
Check the displayed DTC.		 Is U1201 a current malfunction? Go to step 4  . It is possible that temporary poor communication occurs. Perform the clear memory.
4 CHECK DTC. 
  1. Turn the ignition switch to ON.
  2. Using the Subaru Select Monitor, read DTC of CAN system.
 Is U1201 a current malfunction? Go to step 5  . It is possible that temporary poor communication occurs. Perform the clear memory.
5 CHECK CONTROL MODULE. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the control modules other than body integrated unit in order.
    NOTE: When disconnecting ECM or VDC CM, connect resistance of 120 Ω between CAN Hi and CAN Lo as an alternative of end resistance.
  3. Turn the ignition switch to ON.
  4. Using the Subaru Select Monitor, read DTC of CAN system.
 Is there any control module that U1201 is not detected as current malfunction? Replace the control module. Repeat  1) to  4) in step 5 until U1201 is not detected.
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