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 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 and variable flow change solenoid 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 B14A7 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. ACTIVE TEST  .
   1. Attach the manifold gauge.
   2. Using the Subaru Select Monitor, check the following items in the [Active Test] of [Air Conditioner]. Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)>ACTIVE TEST .
      • Variable Flow Change Sol Duty Setting

   Did the variable flow change solenoid operate to the specified target, and the pressure change?

   Yes:  Variable flow change solenoid circuit is normal.

   No:  Go to  3.

3. CHECK VARIABLE FLOW CHANGE SOLENOID  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the variable flow change solenoid connector.
   3. Using a tester, measure the resistance between terminals of the solenoid.

      Terminals 

      (F160) No. 1 - (F160) No. 2:

      Is the resistance 10 - 12 Ω?

      Yes:  Go to  4.

      No:  Replace the compressor. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>COMPRESSOR .

4. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Disconnect the A/C control panel connector.
   2. Using a tester, check for continuity between the harness terminals.

      Connector and terminal 

      (F160) No. 2 - (i88) No. 11:

      (F160) No. 1 - Chassis ground:

      Is there continuity?

      Yes:  Go to  5.

      No:  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 and terminal 

   (F160) No. 2 - Chassis ground:

   (F160) No. 1 - (F160) No. 2:

   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 ).