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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 4374 FMI 19 (ACM) Diesel Exhaust Fluid System is Not Being Controller as Expected

DESCRIPTION:
DEF system is not being controlled as expected.

MONITORED PARAMETER:
1. DEF pump speed.
2. Pump duty cycle.

TYPICAL ENABLING CONDITIONS:
1. DEF pump operation is above.
2. Below defined thresholds.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
2 minutes

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
SCR ADS Self-Check.

NOTE: If any other codes active, fix those first.

PROBABLE CAUSES:
1. Inspect the DEF pump connector/harness.
2. DEF pump failure.

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