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

DTC U1223 CAN-HS VDC/ABS NO-RECEIVE DATA

DTC DETECTING CONDITION:

Defective VDC/ABSCM. (If error is in the main harness, DTC P0600 High-speed CAN circuit is input at the same time.)

TROUBLE SYMPTOM:

ABS warning light and VDC warning light illuminates.

WIRING DIAGRAM:

• VDC model:

• ABS model

STEPCHECKYESNO

1.CHECK DTC.

Using the Subaru Select Monitor, read all DTCs.

Are there DTC U1201 or U1202?

Perform the diagnosis according to DTC.

2.CHECK DTC.

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

Is U1223 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 U1223 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

VDC model:

(B40) No. 6 — (B310) No. 35:
(B40) No. 14 — (B310) No. 10:

ABS model

(B40) No. 6 — (B135) No. 26:
(B40) No. 14 — (B136) No. 11:

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 U1223 a current malfunction?

6.CHECK DTC.

Using the Subaru Select Monitor, read all DTCs.

Is P1718 or P0600 displayed?

Replace the VDC/ABS CM.

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 U1223 a current malfunction?

Repair or replace the harness.

8.CHECK CONNECTOR.

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.

Is there connector terminal where poor contact exists?

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

Temporary poor contact occurs.