DTC P0071 Ambient Air Temperature Sensor Circuit "A" Range/Performance: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

1. CHECK FOR ANY OTHER DTC ON DISPLAY. 

   Is any other DTC displayed?

   • Yes  : Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>List of Diagnostic Trouble Code (DTC) .
   • No  : Go to 2. 
2. CHECK CURRENT DATA. 
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor or a general scan tool, read the value of [Ambient air temperature].
      NOTE:

      • Subaru Select Monitor

        For detailed operation procedures, refer to "READ CURRENT DATA FOR HVAC SYSTEM". Refer to HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)>READ CURRENT DATA.

      • General scan tool

        For detailed operation procedures, refer to the general scan tool operation manual.

3. Read the change of the value in [Ambient air temperature] while heating and cooling the ambient sensor using a hair dryer.
   CAUTION: Do not heat the part to the temperature where you cannot touch it with your bare hand in order to prevent burning yourself and protect the part.

Does the value of [Ambient air temperature] change between heating and cooling?

• Yes  : Repair the poor contact of ECM connector.
• No  : Replace the ambient sensor. Ref. to HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Ambient Sensor .