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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3223 FMI 7 (ACM) NOx RAW Sensor Not Ready After Dewpoint Enable Check

DESCRIPTION:
NOx inlet sensor failure to active.

MONITORED PARAMETER:
NOx inlet sensor.

TYPICAL ENABLING CONDITIONS:
NOx raw count.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Always on

DASH LAMPS:
MIL

ENGINE REACTION:
None

VERIFICATION:
Once engine is at standard operating temperature, drive at highway speed with loaded trailer above 1130 rpm continuously for twenty minutes.

NOTE: If codes 5357-16 or 5357-18 present, fix those first.

PROBABLE CAUSES:
1. Perform a stationary regen.
2. SCR inlet NOx sensor.

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