Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1511 valve relay

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1511 valve relay

DTC DETECTING CONDITION:

A fault is detected if valve relay drive voltage failure is detected.

TROUBLE SYMPTOM:

• ABS does not operate.

• EBD does not operate.

• VDC does not operate.

• Hill hold does not function.

• EyeSight does not operate. (Models with EyeSight)

WIRING DIAGRAM:

Vehicle dynamics control system Vehicle Dynamics Control System

STEP	CHECK	YES	NO
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. 5 (+) — Chassis ground (−): (B310) No. 16 (+) — Chassis ground (−):	Is the voltage 10 — 15 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1511 VALVE RELAY	Repair the power supply circuit.
2.CHECK VDCCM&H/U INPUT VOLTAGE. Calculate the voltage difference measured in step 1. A: (B310) No. 5 (+) — Chassis ground (−): B: (B310) No. 16 (+) — 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 C1511 VALVE RELAY
3.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. 46 — Chassis ground:	Is the resistance less than 10 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1511 VALVE RELAY	Repair the VDCCM&H/U ground harness.
4.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 C1511 VALVE RELAY
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&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1511 VALVE RELAY
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 poor contact in the harness and connector or a temporarily noise interference.

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