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Detroit DD15 EPA10 (2010-13) Fault Code: SPN 4364 FMI 18 (ACM) Selective Catalyst Reduction NOx Conversion Low

DESCRIPTION:
This fault code sets when the Aftertreatment Control Module (ACM) detects that the NOx conversion is lower than a calibrated threshold.

MONITORED PARAMETER:
1. Selective Catalyst Reduction (SCR) inlet NOx sensor.
2. SCR outlet NOx sensor.

TYPICAL ENABLING CONDITIONS:
1. Diesel Exhaust Fluid (DEF) dosing enabled.
2. 1000 – 1500 rpm.
3. 15 – 100% load.
4. SCR inlet temperature sensor less than 650°C (1200°F).
5. Ambient temperature greater than 0°C (32°F).
6. Coolant temperature greater than 70°C (158°F).
7. Non-regeneration conditions present.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
30 minutes

DASH LAMPS:
MIL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Parked regeneration

NOTE: If any 3364-xx codes present, fix those first.

PROBABLE CAUSES:
1. DEF tank contaminated (fuel, water, etc…).
2. DEF pressure sensor failure.
3. DEF pressure sensor connector/harness.
4. Perform stationary regen.
5. DEF air supply lines cracked/leaked/kinked.

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