P0072-Ambient Temp Sensor Low - Chrysler Pacifica CS 2004 Service Manual

Symptom:

P0072-AMBIENT TEMP SENSOR LOW

When Monitored and Set Condition:
P0072-AMBIENT TEMP SENSOR LOW
When Monitored: The ignition key on.
Set Condition: Ambient Temperture Sensor is less than .0392 of a volt at the PCM. One
Trip Fault.
AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW 0.3 VOLTS
AMBIENT AIR TEMPERATURE SENSOR INTERNAL FAILURE
(K145) AAT SIGNAL CIRCUIT SHORTED TO GROUND
(K25) AAT SIGNAL CIRCUIT SHORTED TO (K4) SENSOR GROUND CIRCUIT
PCM
TEST
1 Ignition on, engine not running.
With the DRBIII , read the Ambient Air Temperature Sensor voltage.
Is the voltage below 0.3 of a volt?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION symptom in the
No
2 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII , read Ambient Air Temperature Sensor voltage.
Is the voltage above 1.0 volt?
Yes → Replace the Ambient Air Temperature Sensor.
→ Go To 3
No
3 Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K25) AAT Signal circuit in the
Ambient Air Temperature Sensor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the (K145) AAT Signal circuit.
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
49
APPLICABILITY
All
All
All