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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (LAN Communication System (Diagnostics)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U1211 Can-HS ECM Data Abnormal >> 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 DTC. 
Read all DTCs using the Subaru Select Monitor.< Refer to OPERATION , Subaru Select Monitor. >		 Is there DTC U1202? Perform the diagnosis according to DTC. Go to step 2  .
2 CHECK DTC. 
Read the DTC of body integrated unit using Subaru Select Monitor.		 Is U1211 a current malfunction? Go to step 3  . Go to step 4  .
3 CHECK ECM. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the ECM connector.
  3. Connect the disconnected connectors.
  4. Turn the ignition switch to ON.
  5. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1211 a current malfunction? Replace the ECM.< Refer to REMOVAL , Engine Control Module (ECM). > Go to step 4  .
4 CHECK HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Shake the harness used for CAN communication circuit.
  3. Turn the ignition switch to ON.
  4. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1211 a current malfunction? Repair the poor contact or temporary open circuit of harness. Go to step 5  .
5 CHECK CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector that is connected to high speed CAN circuit.
 Is there poor contact of connector? Repair the connector terminal where poor contact exists, or replace harness. It is possible that temporary poor communication occurs.
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