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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 4374 FMI 3 (ACM) Diesel Exhaust Fluid (DEF) Pump Speed Signal Above Measurement Range

DESCRIPTION:
DEF pump speed signal above measurement range.

MONITORED PARAMETER:
DEF pump speed frequency.

TYPICAL ENABLING CONDITIONS:
1. DEF pump enabled.
2. On-Off-Cycle request.

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
2 minutes

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 10%

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.
3. ACM (Aftertreament Control Module ECM) failure.

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