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

COMPASS/MINI-TRIP COMPUTER
Symptom:

FCM - AMBIENT TEMP SENSOR INPUT LOW

When Monitored and Set Condition:
FCM - AMBIENT TEMP SENSOR INPUT LOW
When Monitored: Continuous with the ignition on.
Set Condition: The FCM detects less than 0.5 volts on the Ambient Temperature Sensor
Signal circuit.
AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO SENSOR RETURN CIRCUIT
FRONT CONTROL MODULE
TEST
1 Disconnect the Ambient Temperature Sensor harness connector.
Close all vehicle doors.
Turn the ignition on.
With the DRBIII in Sensors, read the Ambient Temperature Sensor voltage.
Is the voltage above 4.8 volts?
Yes → Replace the Ambient Temperature Sensor.
→ Go To 2
No
2 Turn the ignition off.
Disconnect the IPM C3 harness connector.
Disconnect the Ambient Temperature Sensor harness connector.
Measure the resistance between ground and the Ambient Temperature Sensor Signal
circuit.
Is the resistance below 5.0 ohms?
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 ground.
Perform BODY VERIFICATION TEST - VER 1.
306
APPLICABILITY
All
All