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

WARNING: This page is about a different variant/trim than selected.

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DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:
- Hard to start
- Improper idling
- Poor driving performance
NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Courtesy of SUBARU OF AMERICA, INC.

CHECK DTC .
Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC other than P0071 displayed? (Current malfunction)

Yes : Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

No : Go to 2.
CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, read the value in [Ambient Air Temperature] for [Air Conditioner].
  NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .
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 AIR CONDITIONER (HEV)>AMBIENT SENSOR .