Subaru Crosstrek Service Manual: Dtc c1421 ecm control system

DTC detecting condition:

ECM malfunctioning

Trouble symptom:

• ABS does not operate.

• VDC does not operate.

• Hill start assist does not operate.

1.CHECK COOPERATION CONTROL FEASIBILITY OF ECM USING SUBARU SELECT MONITOR.

1) Start the engine, and run the engine at idle approximately 5 minutes.

2) Using the Subaru Select Monitor, select “Data monitor”. Subaru Select Monitor > OPERATION">

3) Check the «E/G Control Stop Flag» displayed on screen.

Is the «E/G Control Stop Flag» “1”?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1421 ECM CONTROL SYSTEM">Go to Step 4.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1421 ECM CONTROL SYSTEM">Go to Step 2.

2.CHECK WARNING LIGHT.

Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.

Does the VDC warning light illuminate?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1421 ECM CONTROL SYSTEM">Go to Step 3.

VDC is normal. Perform the Clear Memory Mode. Clear Memory Mode">

NOTE:

DTC may be recorded if cranking is performed during driving.

3.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of ECM connector?

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1421 ECM CONTROL SYSTEM">Go to Step 4.

4.CHECK DTC OF ECM.

Read the DTC relating the ECM using the Subaru Select Monitor. 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 C1421 ECM CONTROL SYSTEM">Go to Step 5.

5.CHECK VDCCM&H/U.

1) Connect all connectors.

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

3) Perform the Inspection Mode. Inspection Mode">

4) 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 C1421 ECM CONTROL SYSTEM">Go to Step 6.

6.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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