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Subaru Crosstrek Service Manual: Dtc c0051 valve relay

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC C0051 VALVE RELAY

DTC detecting condition:

Defective valve relay

Trouble symptom:

ABS does not operate.

EBD does not operate.

VDC does not operate.

EyeSight does not operate.

Wiring diagram:

Vehicle dynamics control system Vehicle Dynamics Control System > WIRING DIAGRAM">

STEPCHECKYESNO

1.CHECK VDCCM&H/U INPUT VOLTAGE.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the VDCCM&H/U.

3) Run the engine at idle.

4) Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 1 (+) — Chassis ground (−):

(B310) No. 20 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">Go to Step 2.

Repair the power supply circuit.

2.CHECK VDCCM&H/U INPUT VOLTAGE.

Calculate the voltage difference measured in step 1.

A: (B310) No. 1 (+) — Chassis ground (−):

B: (B310) No. 20 (+) — Chassis ground (−):

Is the voltage difference between A and B 2 V or more?

Repair the power supply circuit.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">Go to Step 3.

3.CHECK INSTALLATION OF VDCCM&H/U GROUND.

Is the VDCCM&H/U ground terminal installation bolt (ground bolt fixing onto the side frame upper face) installed correctly?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">Go to Step 4.

Install the VDCCM&H/U ground terminal installation bolt correctly.

4.CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).

1) Turn the ignition switch to OFF.

2) Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 26 — Chassis ground:

Is the resistance less than 10 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">Go to Step 5.

Repair the VDCCM&H/U ground harness.

5.CHECK VDCCM&H/U VALVE RELAY.

Measure the resistance between VDCCM&H/U terminals.

Connector & terminal

No. 1 — No. 26:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">Go to Step 6.

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

6.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between generator, battery and VDCCM&H/U?

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">Go to Step 7.

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

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0051 VALVE RELAY">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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