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.
POSSIBLE CAUSES
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 ACTION APPLICABILITY
1 Disconnect the Ambient Temperature Sensor harness connector.
Close all vehicle doors.
Turn the ignition on.
With the DRBIIIt in Sensors, read the Ambient Temperature Sensor voltage.
Is the voltage above 4.8 volts?
All
Yes → Replace the Ambient Temperature Sensor.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 2
2 Turn the ignition off.
Disconnect the IPM C3 harness connector.
Disconnect the Ambient Temperature Sensor harness connector.
Measure the resistance between ground and theAmbient Temperature Sensor Signal
circuit.
Is the resistance below 5.0 ohms?
All
Yes → Repair the Ambient Temperature Sensor Signal circuit for a short
to ground.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 3
306
COMPASS/MINI-TRIP COMPUTER
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