Subaru Crosstrek Service Manual: Dtc c1431 at

DTC detecting condition:

Defective TCM

Trouble symptom:

• ABS does not operate.

• VDC does not operate.

1.CHECK TCM.

1) Start the engine.

2) Read the DTC of the TCM. Read Diagnostic Trouble Code (DTC)">

Are any DTCs displayed?

Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1431 AT">Go to Step 2.

2.CHECK VDCCM&H/U.

1) Turn the ignition switch to OFF.

2) After turning the ignition switch to ON for approx. 10 seconds, turn it to OFF.

3) Turn the ignition switch to ON again.

4) Perform the Clear Memory Mode. Clear Memory Mode">

5) Perform the Inspection Mode. Inspection Mode">

6) Read the DTC. Read Diagnostic Trouble Code (DTC)">

Is the same DTC displayed?

Replace the VDCCM only. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) > REPLACEMENT">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1431 AT">Go to Step 3.

3.CHECK DETECTION OF OTHER DTCS FOR VDC.

Read Diagnostic Trouble Code (DTC)">

Is any other DTC displayed?

Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)">

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

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