Detroit DD13 GHG14 (2014-16) Fault Code: SPN 4364 FMI 18 (ACM) SCR NOx Conversion Efficiency Low
DESCRIPTION:
This code sets when the Aftertreatment Control Module (ACM) detects that the Selective Catalyst Reduction (SCR) NOx conversion efficiency is low.
MONITORED PARAMETER:
1. SCR inlet NOx sensor.
2. SCR outlet NOx sensor.
TYPICAL ENABLING CONDITIONS:
1. Diesel Exhaust Fluid (DEF) dosing enabled.
2. 1000 to 2100 rpm.
3. 15 to 100% load.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
TYPICAL DURATION:
30 minutes
DASH LAMPS:
MIL
ENGINE REACTION:
None
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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