Detroit DD15 GHG14 (2014-16) Fault Code: SPN 171 FMI 4 (CPC) Ambient Temperature Sensor Failed Low
DESCRIPTION:
Ambient temperature input is shorted to ground.
MONITORED PARAMETER:
Ambient temperature
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Always enabled
TYPICAL DURATION:
2 seconds
DASH LAMPS:
CEL
ENGINE REACTION:
None
VERIFICATION:
1. Key cycle: 5 minutes off.
2. Engine Idle: 2 minutes.
PROBABLE CAUSES:
1. Ambient air temperature sensor not programmed correctly in ECM.
2. Ambient air temperature sensor connector/harness.
3. Ambient air temperature sensor.
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