Fcm - Ambient Temp Sensor Input Open - Dodge Ram 2004 Service Manual

COMPASS/MINI-TRIP COMPUTER
Symptom:

FCM - AMBIENT TEMP SENSOR INPUT OPEN

When Monitored and Set Condition:
FCM - AMBIENT TEMP SENSOR INPUT OPEN
When Monitored: Continuous with the ignition on.
Set Condition: The FCM detects more than 5.0 volts on the Ambient Temperature Sensor
Signal circuit.
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR RETURN CIRCUIT OPEN
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
FRONT CONTROL MODULE
TEST
1 Disconnect the Ambient Temperature Sensor harness connector.
Connect a jumper wire between the sensor signal and sensor ground circuits.
Close all vehicle doors.
Turn the ignition on.
With the DRBIII in Sensors, read the Ambient Temperature Sensor voltage.
Is the voltage below 0.5 volts?
Yes → Replace the Ambient Temperature Sensor.
→ Go To 2
No
2 Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the IPM C3 harness connector.
Measure the voltage between the Ambient Temperature Sensor Signal circuit and
ground.
Is there any voltage present?
Yes → Repair the Ambient Temperature Sensor Signal circuit for a short
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
to voltage.
Perform BODY VERIFICATION TEST - VER 1.
308
APPLICABILITY
All
All