Chrysler 300M 2002 Service Manual page 2467

DRIVEABILITY - NGC
Symptom List:
P0070-AMBIENT TEMP SENSOR STUCK
P0071-AMBIENT TEMP SENSOR PERFORMANCE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0070-AMBIENT TEMP SENSOR
STUCK.
When Monitored and Set Condition:
P0070-AMBIENT TEMP SENSOR STUCK
When Monitored: Engine Running.
Set Condition: After 4 warm-up cycles, the PCM did not see a 2°C (35°F) change in the
Ambient Temperature Sensor voltage within 200 miles . Two Trip Fault
P0071-AMBIENT TEMP SENSOR PERFORMANCE
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 temperartue sensors
an error is detected. Two Trip Fault.
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
POSSIBLE CAUSES
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