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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 4334 FMI 4 (ACM) Diesel Exhaust Fluid Pressure Sensor Circuit Failed Low

DESCRIPTION:
Diesel exhaust fluid (DEF) pressure sensor circuit voltage below normal, or shorted to low source.

MONITORED PARAMETER:
Diesel exhaust fluid (DEF) pressure sensor.

TYPICAL ENABLING CONDITIONS:
Always enabled

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Always enabled

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Engine idle: One minute.

PROBABLE CAUSES:
1. DEF pressure sensor.
2. DEF pressure sensor connector/harness.

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