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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3361 FMI 31 (ACM) Diesel Exhaust Fluid Dosing Unit Error

DESCRIPTION:
The fault indicates that the diesel exhaust fluid (DEF) dosing unit was switch off before completing a cycle.

MONITORED PARAMETER:
DEF pressure

TYPICAL ENABLING CONDITIONS:
When service routine is enabled and during infrequent in-use check under non DEF dosing conditions.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Service tool and infrequent in-use checks during DEF dosing conditions.

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Selective catalyst reduction (SCR) airless dosing system (ADS) self-check routine.

NOTE: If any other codes present, repair those first.

PROBABLE CAUSES:
1. DEF dosing unit harness connector/wiring.
2. Dosing unit failure.

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