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

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

DTC DETECTING CONDITION:

Not received data from VDC/ABS CM. (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 illuminate.

WIRING DIAGRAM:

• Gasoline engine model

• Diesel engine model

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 U1223 a current malfunction?

3.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (B280, B310 or B301, B55, B134 or 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 U1223 a current malfunction?

4.CHECK HARNESS.

1) Disconnect all connectors (B280, B310 or B301, B55, B134 or 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

Models with VDC

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

Models without VDC

(B40) No. 6 — (B301) No. 26:
(B40) No. 14 — (B301) No. 11:

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 U1223 a current malfunction?

6.CHECK DTC.

Read all DTCs using the Subaru Select Monitor.

Is P1718 or P0600 displayed?

Replace the VDC/ABS 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 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, B134 or B135, B230, B231, B450) 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.