DTC B1435: Evaporator Temperature Sensor Circuit Short-Circuit

DTC detecting condition: 

Evaporator sensor circuit is shorted.

Trouble symptom: 

• Compressor does not operate. (Variable compressor)
• Evaporator temperature is falsely recognized as low, and the compartment temperature is adjusted.

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 evaporator sensor 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 B1435 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 EVAPORATOR SENSOR  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the evaporator 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 B1434 displayed? (Current malfunction)

   Yes:  Replace the evaporator sensor. Ref. to AIR CONDITIONER (EXCEPT FOR HEV)>EVAPORATOR SENSOR .

   No:  Go to  3.

3. CHECK HARNESS  .

   Using a tester, measure the voltage between terminals in evaporator sensor connector.

   Connector and terminal 

   (i172) No. 1 (+) - (i172) No. 2 (-):

   Is the voltage 4.5 - 5.5 V?

   Yes:  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.

   No:  Go to  4.

4. CHECK HARNESS (SHORTED BETWEEN LINES)  .
   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 terminals in evaporator sensor connector.

      Connector and terminal 

      (i172) No. 1 - (i172) 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 .