Code No. P0071:
Ambient Temperature Sensor
DIAGNOSIS CONTENT
Signal error, only in case of CAN
TROUBLE JUDGMENT
Check Condition
Judgment Criterion
- The CAN signal is defect and the CAN does not report an error.
FAIL SAFE FUNCTION
- Controls as if the ambient temperature is 0°C.
- A/C: OFF
- Operates the fan.
PROBABLE CAUSE
- Failed ambient temperature sensor
- Failed electrical harness in ambient temperature sensor circuit
- Failed A/C-ECU
- Failed engine-ECU
(Refer to GROUP 55 - Troubleshooting - Code No. B1034: Ambient Temperature Sensor
System 
.)