LAN SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC U1211 CAN-HS ECM DATA ABNORMAL

DTC DETECTING CONDITION:

Received error data from ECM.

TROUBLE SYMPTOM:

Defective data on CAN communication occurs.

WIRING DIAGRAM:

• Gasoline engine model

• Diesel engine model

STEPCHECKYESNO

1.CHECK DTC.

Using the Subaru Select Monitor, read all DTCs.

Is there DTC U1202?

Perform the diagnosis according to DTC.

2.CHECK DTC.

Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1211 a current malfunction?

3.CHECK ECM.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

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.

4.CHECK HARNESS.

1) Shake the harness used for CAN communication circuit.

2) 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.

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 contact occurs.