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

DTC U1321 CAN-LS METER NO-RECEIVE DATA

DTC DETECTING CONDITION:

Not received data from meter.

TROUBLE SYMPTOM:

Engine may not be started.

WIRING DIAGRAM:

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1.CHECK ALL DTCS.

Using the Subaru Select Monitor, read all DTCs.

Is U1300 or U1302 displayed?

Perform the diagnosis according to DTC.

2.CHECK DTC.

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

Is U1321 a current malfunction?

3.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (i84, i10, i88, i85 or i50, B419) that are connected to low 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 U1321 a current malfunction?

Replace the combination meter.

4.CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (i84, i10, i88, i85 or i50, B419) that are connected to low speed CAN communication line.

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

Connector & terminal

(i84) No. 1 — (i10) No. 27 (combination meter):
(i84) No. 9 — (i10) No. 26 (combination meter):
(i84) No. 1 — (i88) No. 20 (A/C):
(i84) No. 9 — (i88) No. 19 (A/C):
(i84) No. 1 — (i85) No. 12 (audio):
(i84) No. 9 — (i85) No. 11 (audio):
(i84) No. 1 — (i50) No. 18 (navigation):
(i84) No. 9 — (i50) No. 6 (navigation):
(i84) No. 1 — (B419) No. 5 (gateway CM):
(i84) No. 9 — (B419) No. 4 (gateway CM):

Is harness normal?

Repair or replace the harness.

5.CHECK COMBINATION METER.

1) Connect the disconnected connectors.

2) Perform the self-diagnosis of combination meter.

Is the self-diagnosis OK?

Replace the combination meter.

6.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (i84, i10, i88, i85 or i50, B419) that are connected to low 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 U1321 a current malfunction?

Replace the body integrated unit.

7.CHECK DTC.

1) Shake the harness used for low speed CAN communication circuit.

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

Is U1321 a current malfunction?

Repair the poor contact, open circuit of harness or replace harness.

8.CHECK CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (i84, i10, i88, i85 or i50, B419) that are connected to low speed CAN communication line.

Is there poor contact of connector terminal?

Repair the connector terminal, or replace harness.

It is possible that temporary poor contact occurs.