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Subaru Crosstrek Service Manual: Dtc u1651 lost communication with meter (uart)

INSTRUMENTATION/DRIVER INFO (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC U1651 LOST COMMUNICATION WITH METER (UART)

DTC detecting condition:

UART data from combination meter is not received.

Trouble symptom:

LCD is not displayed.

Wiring diagram:

Multi-function display (MFD) system Multi-function Display (MFD) System > WIRING DIAGRAM">

STEPCHECKYESNO

1.CHECK LAN SYSTEM.

Read the DTC of the LAN system using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC) > OPERATION">

Are any DTCs displayed?

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1651 LOST COMMUNICATION WITH METER (UART)">Go to Step 2.

2.CHECK CONNECTOR.

1) Disconnect the MFD connector and combination meter connector.

2) Connect the disconnected connectors.

3) Read the DTC of the MFD using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is DTC U1651 a current malfunction?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1651 LOST COMMUNICATION WITH METER (UART)">Go to Step 3.

There was poor contact of connector.

3.CHECK HARNESS (OPEN CIRCUIT).

1) Disconnect the MFD connector and combination meter connector.

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

Connector & terminal

(i10) No. 28 — (i122) No. 9:

Is the resistance 10 ? or less?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1651 LOST COMMUNICATION WITH METER (UART)">Go to Step 4.

Repair the open circuit of harness or replace harness.

4.CHECK HARNESS (GROUND SHORT CIRCUIT).

Using the tester, measure the resistance between terminals.

Connector & terminal

(i122) No. 9 — Chassis ground:

Is the resistance 10 ? or less?

Repair the short circuit of harness or replace harness.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1651 LOST COMMUNICATION WITH METER (UART)">Go to Step 5.

5.CHECK COMBINATION METER.

1) Replace the combination meter. Combination Meter">

2) Read the DTC of the MFD using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is DTC U1651 a current malfunction?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1651 LOST COMMUNICATION WITH METER (UART)">Go to Step 6.

There was something wrong with the combination meter.

6.CHECK COMBINATION METER.

1) Replace the current combination meter with the original combination meter.

2) Replace the MFD. Multi-function Display (MFD)">

3) Read the DTC of the MFD using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is DTC U1651 a current malfunction?

Replace the combination meter. Combination Meter">

There was an abnormality in MFD.

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Specification
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