Symptom:
P0071-AMBIENT TEMP SENSOR PERFORMANCE
When Monitored and Set Condition:
P0071-AMBIENT TEMP SENSOR PERFORMANCE
When Monitored: Engine off time is greater than 480 minutes. Ambient temperature is
greater than -23°C (-9°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 temperartue sensors
an error is detected. Two Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
(K145) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW 0.1 VOLT
(K145) AAT SIGNAL CIRCUIT OPEN
(K4) SENSOR GROUND CIRCUIT OPEN
(K145) AAT SIGNAL CIRCUIT SHORTED TO GROUND
(K145) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND
PCM LOW
PCM HIGH
TEST ACTION APPLICABILITY
1 NOTE: After repairing this DTC, the AAT sensor value will not refresh until
either the ignition is OFF for more than 5 hours or the vehicle has been
driven at a speed greater than 20 MPH for more than 2 minutes.
Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
48
DRIVEABILITY - NGC
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