P0071

Tests 1 - 4:

Tests 5 - 7:

Tests 8 - 9:

SYMPTOM
P0071-AMBIENT TEMP SENSOR PERFORMANCE

TEST NOTE
This symptom is diagnosed using the test P0070-AMBIENT TEMP SENSOR STUCK.

WHEN MONITORED
Engine OFF time is greater than 480 minutes. Ambient temperature is greater than 4 °C (39 °F).

SET CONDITION
After a calibrated amount of cool down time, the PCM compares the ECT Sensor, IAT Sensor and the Ambient Air Temperature Sensor values. If the Ambient Air Temperature Sensor value is not within 10 °C (53 °F) of the other two temperature sensors an error is detected. Two Trip Fault.

POSSIBLE CAUSES
- Intermittent condition
- Ambient temperature sensor signal circuit shorted to battery voltage
- Ambient air temperature sensor voltage below 1.0 volt
- Ambient TEMP sensor signal circuit open
- Sensor ground circuit open
- Sensor signal circuit shorted to ground
- Ambient temperature sensor signal circuit shorted to sensor ground
- PCM low
- PCM high