DTC U1211 Can-HS ECM Data Abnormal: Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: CAN-HS ECM Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. 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. Turn the ignition switch to OFF. Disconnect the connector from ECM. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1211 a current malfunction?	Replace the ECM. < Ref. to REMOVAL , Engine Control Module (ECM). >	Go to step 4 .
4 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for CAN communication circuit. Turn the ignition switch to ON. 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. Turn the ignition switch to OFF. 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.