Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b14a7 variable solenoid valve circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b14a7 variable solenoid valve circuit

DTC DETECTING CONDITION:

Variable flow change solenoid valve circuit is open or shorted

TROUBLE SYMPTOM:

Refrigerant pressure cannot be changed.

WIRING DIAGRAM:

Air conditioning system Air Conditioning System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK CONNECTOR. 1) Check connecting condition of the A/C CM connector and variable flow change solenoid connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B14A7 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14A7 VARIABLE SOLENOID VALVE CIRCUIT	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2.CHECK SYSTEM OPERATION. 1) Attach the manifold gauge. 2) Using the Subaru Select Monitor, change the setting of «Variable Flow Change Sol Duty Setting» from the A/C diagnosis and perform the system operation check. System Operation Check Mode	Did the variable flow change solenoid operate to the specified target, and the pressure change-	Variable flow change solenoid circuit is normal.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14A7 VARIABLE SOLENOID VALVE CIRCUIT
3.CHECK VARIABLE FLOW CHANGE SOLENOID. 1) Disconnect the variable flow change solenoid connector. 2) Using a tester, measure the resistance between terminals of the solenoid. Connector & terminal (Compressor solenoid side) No. 1 — No. 2:	Is the resistance 10 — 12 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14A7 VARIABLE SOLENOID VALVE CIRCUIT	Replace the compressor. Compressor > REMOVAL
4.CHECK HARNESS (OPEN CIRCUIT). 1) Disconnect the A/C CM connector. 2) Using a tester, check for continuity between the harness terminals. Connector & terminal (B506) No. 2 — (i181) No. 8: (B506) No. 1 — Chassis ground:	Is there continuity-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14A7 VARIABLE SOLENOID VALVE CIRCUIT	Repair or replace the open circuit of harness.
5.CHECK HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND). Using a tester, check for continuity between the harness terminals. Connector & terminal (B506) No. 2 — Chassis ground: (B506) No. 1 — (B506) No. 2:	Is there continuity-	Repair or replace the short circuit of the harness.	Replace the A/C CM. Control Unit > REMOVAL

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