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

DTC U1222 CAN-HS TCM NO-RECEIVE DATA

DTC DETECTING CONDITION:

TCM has error, harness between the main harness splice and TCM is open, connectors are not connected securely, or the terminal has poor crimping.

TROUBLE SYMPTOM:

Malfunction indicator light illuminates.

WIRING DIAGRAM:

• VDC model:

• ABS model

STEPCHECKYESNO

1.CHECK DTC.

Using the Subaru Select Monitor, read all DTCs.

Are there any U1201, U1202, DTCs other than for the body integrated unit?

Perform the diagnosis according to DTC.

2.CHECK DTC.

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

Is U1222 a current malfunction?

3.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (B280, B310 or B301, B55, B135 or B136, B230, B231) that are connected to high speed CAN communication line.

3) Connect the disconnected connectors.

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

Is U1222 a current malfunction?

4.CHECK HARNESS.

1) Disconnect all connectors (B280, B310 or B301, B55, B135 or B136, B230, B231) that are connected to high speed CAN communication line.

2) Using the tester, measure the resistance between terminals of harness.

Connector & terminal

(B55) No. 17 — (B40) No. 14:
(B55) No. 18 — (B40) No. 6:

Is the resistance less than 10 Ω?

Repair or replace the harness.

5.CHECK DTC.

1) Connect the disconnected connectors.

2) Start the engine and stop.

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

Is U1222 a current malfunction?

6.CHECK DTC.

Using the Subaru Select Monitor, read all DTCs.

Are DTCs P0600 or P0044, P0045, P0140 displayed?

Replace the TCM.

Replace the body integrated unit.

7.CHECK HARNESS.

1) Shake the harness used for CAN communication circuit.

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

Is U1222 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 in connector terminal?

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

Temporary poor contact occurs.