Subaru Crosstrek Service Manual: Dtc c0074 master cylinder pressure sensor output

DTC detecting condition:

Defective pressure sensor

Trouble symptom:

• ABS does not operate.

• VDC does not operate.

• EyeSight does not operate.

1.CHECK STOP LIGHT SWITCH CIRCUIT.

Check stop light switch open circuit.

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0074 MASTER CYLINDER PRESSURE SENSOR OUTPUT">Go to Step 2.

Repair the stop light switch circuit.

NOTE:

If there is malfunction in the stop light circuit, DTC may be recorded in the memory.

2.CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

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

2) Read the «Master Cylinder Pressure Sensor» displayed on display.

With the brake pedal released, does the value for «Master Cylinder Pressure Sensor» fall within 0 — 11 bar?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0074 MASTER CYLINDER PRESSURE SENSOR OUTPUT">Go to Step 3.

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

3.CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

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

2) Read the «Master Cylinder Pressure Sensor» displayed on display.

When the brake pedal is operated, does the value of «Master Cylinder Pressure Sensor» change in accordance with the brake pedal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0074 MASTER CYLINDER PRESSURE SENSOR OUTPUT">Go to Step 4.

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

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

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0074 MASTER CYLINDER PRESSURE SENSOR OUTPUT">Go to Step 5.

5.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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