DTC B14A4: Refrigerant Pressure Sensor Circuit Short-Circuit

DTC detecting condition: 

Refrigerant pressure sensor circuit is shorted.

Trouble symptom: 

Compressor does not operate. (Variable compressor)

Wiring diagram: 

Air conditioning system Ref. to WIRING SYSTEM (IMPREZA MODEL)>AIR CONDITIONING SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK CONNECTOR  .
   1. Check connecting condition of the A/C control panel connector, refrigerant pressure sensor connector and coupling connector.
   2. Turn the ignition switch to ON.
   3. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B14A4 displayed? (Current malfunction)

      Yes:  Go to  2.

      No:  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 PRESSURE SENSOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the refrigerant pressure sensor.
   3. Turn the ignition switch to ON.
   4. Read the DTC of [Air Conditioner] using the Subaru Select Monitor. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B14A3 displayed? (Current malfunction)

      Yes:  Replace the refrigerant pressure sensor. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>PRESSURE SENSOR .

      No:  Go to  3.

3. CHECK HARNESS (SHORTED BETWEEN LINES AND SHORTED TO GROUND)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from the A/C control panel.
   3. Using a tester, check the continuity between the terminals in refrigerant pressure sensor connector and between refrigerant pressure sensor connector and chassis ground.

      Connector and terminal 

      (B505) No. 1 - (B505) No. 2:

      (B505) No. 2 - Chassis ground:

      Is there continuity?

      Yes:  Repair or replace the short circuit of the harness.

      No:  Replace the A/C control panel. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>CONTROL PANEL .