Chrysler 300M 2002 Service Manual page 2471

DRIVEABILITY - NGC
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.
INTERMITTENT CONDITION
AMBIENT TEMPERATURE SENSOR INTERNAL FAILURE
AMBIENT TEMPERATURE SENSOR SIGNAL SHORTED TO GROUND
AMBIENT TEMPERATURE SENSOR SIGNAL SHORTED TO SENSOR GROUND CIRCUIT
PCM
TEST
1 Ignition on, engine not running.
With the DRBIII , read the Ambient Temperature Sensor voltage.
Is the voltage below 0.3 of a volt?
Yes → Go To 2
No
2 Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII , read Ambient Temperature Sensor voltage.
Is the voltage above 1.0 volt?
Yes → Replace the Ambient Temperature Sensor.
No
3 Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the Ambient Temperature Sensor Signal
circuit in the Ambient Temperature Sensor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the Ambient Temperature Sensor
No
POSSIBLE CAUSES
ACTION
→ Go To 6
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 3
Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 4
42
APPLICABILITY
All
All
All