P0073-Ambient Temp Sensor High - Chrysler Pacifica CS 2004 Service Manual

Symptom:

P0073-AMBIENT TEMP SENSOR HIGH

When Monitored and Set Condition:
P0073-AMBIENT TEMP SENSOR HIGH
When Monitored: The ignition key on.
Set Condition: The Ambient Temperature Sensor voltage is greater than 4.94 volts. One
Trip Fault.
AMBIENT AIR TEMPERATURE SENSOR VOLTAGE ABOVE 4.8 VOLTS
(K25) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
AMBIENT AIR TEMPERATURE SENSOR INTERNAL FAILURE
(K25) AAT SIGNAL CIRCUIT OPEN
(K4) SENSOR GROUND CIRCUIT OPEN
PCM
TEST
1 Ignition on, engine not running.
With the DRBIII , read the Ambient Air Temperature Sensor voltage.
Is the voltage above 4.8 volts?
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.
Measure the voltage of the (K25) AAT Signal circuit in the Ambient Air Temperature
Sensor harness connector.
Is the voltage above 5.2 volts?
Yes → Repair the short to battery voltage in the (K25) AAT Signal
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
51
APPLICABILITY
All
All