Subaru Crosstrek Service Manual: Dtc c1423 different ecu specifications

DTC detecting condition:

Different control module specification

Trouble symptom:

• ABS does not operate.

• VDC does not operate.

• Hill start assist does not operate.

When parameter selection for VDCCM is improper, this DTC may be memorized.

1.CHECK VDCCM&H/U IDENTIFICATION SYMBOL.

Check the identification symbol attached on the H/U. General Description > SPECIFICATION">

Is the identification symbol correct?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 2.

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

2.CHECK PARAMETER SELECTED IN VDCCM.

Subaru Select Monitor > OPERATION">

Does the parameter registered in the VDCCM match the relevant vehicle?

CVT model: Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 3.
MT model: Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 5.

Select and register the correct parameter. Subaru Select Monitor > OPERATION">

3.CHECK TCM SPECIFICATION.

Check the TCM specification.

Is the specification of TCM same as vehicle specification?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 4.

Replace the TCM. Transmission Control Module (TCM)">

4.CHECK CVT SYSTEM.

1) Start the engine.

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

Is DTC of CVT system displayed?

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

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 5.

5.CHECK ECM SPECIFICATION.

Check the ECM specification.

Is the specification of ECM same as vehicle specification?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 6.

Replace the ECM. Engine Control Module (ECM)">

6.CHECK ENGINE SYSTEM.

1) Start the engine.

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

Is engine system DTC displayed?

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

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 7.

7.CHECK VDCCM&H/U.

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

2) Perform the Inspection Mode. Inspection Mode">

3) 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 C1423 DIFFERENT ECU SPECIFICATIONS">Go to Step 8.

8.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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