RAM 3500 Truck 2WD L6-5.9L DSL Turbo VIN C (2003)
Ambient Temperature Sensor / Switch HVAC: Testing and Inspection
FCM-Ambient Temp Sensor Input Low
Test 1 - 2
Test 3
SYMPTOM
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 CAUSE
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Ambient temperature sensor
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Ambient temperature sensor signal circuit shorted to ground
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Ambient temperature sensor signal circuit shorted to sensor return circuit
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Front control module