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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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