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

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Other materials:

Removal
CAUTION:Vehicle components are extremely hot after driving. Be wary of receiving burns from heated parts.1. Disconnect the ground terminal from battery sensor. NOTE2. Lift up the vehicle.3. Remove the under cover. Front Under Cover > REMOVAL4. Disconnect the front oxygen (A/F) sensor connector (A) ...