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

DTC U1227 CAN-HS EPS NO-RECEIVE DATA

DTC DETECTING CONDITION:

Not received data from EPS module.

TROUBLE SYMPTOM:

Steering warning light illuminates.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK DTC.

Read all DTCs using the Subaru Select Monitor.

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 U1227 a current malfunction?

3.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (B280, B310, B135, B230, B231, B450) that are connected to high speed CAN communication line.

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 U1227 a current malfunction?

4.CHECK HARNESS.

1) Disconnect all connectors (B280, B310, B135, B230, B231, B450) that are connected to high speed CAN communication line.

2) Using the tester, check for open, short (power supply-output short, GND-output short) in the harness.

Connector & terminal

(B450) No. 7 — (B40) No. 14:

(B450) No. 6 — (B40) No. 6:

Is harness normal?

Repair or replace the harness.

5.CHECK DTC.

1) Connect the disconnected connectors.

2) Start the engine and stop.

3) Turn the ignition switch to ON.

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

Is U1227 a current malfunction?

6.CHECK DTC.

Using the Subaru Select Monitor, read all DTCs.

Are DTCs P0600 or P1718, C0140 displayed?

Replace the power steering CM.

Replace the body integrated unit.

7.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 U1227 a current malfunction?

Repair or replace the harness.

8.CHECK CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect all the connector that is connected to high speed CAN circuit.

Is there poor contact of connector terminal?

Repair the connector terminal where poor contact exists, or replace harness.

Temporary poor contact occurs.