P0071

Tests 1 - 3:

Tests 4 - 7:

SYMPTOM
P0071 - AMBIENT TEMP SENSOR PERFORMANCE

WHEN MONITORED
With the ignition on Coolant Temperature greater than 71 °C (160 °F) No Ambient Air Temperature Sensor Faults present

SET CONDITION
After 5 warm cycles have occurred (coolant increases from greater than 4.4 °C (40 °F) to a minimum of 71 °C (160 °F) and the odometer mileage has increased 196.6 miles and the Ambient Air Temperature has increased less than 3 °C (5.4 °F). Two trip fault.

POSSIBLE CAUSES
- Intermittent condition
- Ambient air temp sensor voltage below 1.0 volts
- Sensor ground circuit voltage drop
- Ambient air temp sensor signal circuit voltage drop
- PCM