Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b14a6 refrigerant flow sensor circuit short-circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b14a6 refrigerant flow sensor circuit short-circuit

DTC DETECTING CONDITION:

• The voltage of the refrigerant flow sensor signal line decreased to 0.3 V or less.

• Short-circuit in refrigerant flow sensor

TROUBLE SYMPTOM:

A/C does not function because refrigerant flow amount cannot be measured.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

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, refrigerant flow sensor connector and coupling connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B14A6 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14A6 REFRIGERANT FLOW SENSOR CIRCUIT SHORT-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 REFRIGERANT FLOW SENSOR. 1) Disconnect the refrigerant flow sensor connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B14A5 displayed-	Replace the compressor. Compressor > REMOVAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B14A6 REFRIGERANT FLOW SENSOR CIRCUIT SHORT-CIRCUIT
3.CHECK HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND). 1) Disconnect the A/C CM connector. 2) Using a tester, check continuity between terminals. Connector & terminal (B507) No. 2 — (B507) No. 3: (B507) No. 3 — Chassis ground:	Is there continuity-	Repair or replace the short circuit of the harness.	Replace the A/C CM. Control Unit > REMOVAL

Dtc b14a7 variable solenoid valve circuit

DTC DETECTING CONDITION:Variable flow change solenoid valve circuit is open or shortedTROUBLE SYMPTOM:Refrigerant pressure cannot be changed.WIRING DIAGRAM:Air conditioning system Air Conditioning Sy ...

Dtc b14a5 refrigerant flow sensor circuit open

DTC DETECTING CONDITION:• The voltage of the refrigerant flow sensor signal line increased to 4.7 V or more.• Open circuit in refrigerant flow sensorTROUBLE SYMPTOM:A/C does not function b ...

Other materials:

Inspection
1. INSPECTION OF SWITCH UNIT1. Operate the switches to check the continuity between terminals.Preparation tool:Circuit testerSwitch positionTerminal No.StandardOFFA1 and A3Less than 1 -INTA1 and A3Less than 1 -LOA2 and A3Less than 1 -HIA2 and A4Less than 1 -Washer ONB2 and B3Less than 1 -2. Replace ...