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Detroit DD16 GHG14 (2014-16) Fault Code: SPN 4364 FMI 1 (ACM) SCR NOx Conversion Efficiency Very Low

DESCRIPTION:
SCR NOx conversion efficiency very low.

MONITORED PARAMETER:
SCR NOx conversion efficiency.

TYPICAL ENABLING CONDITIONS:
1. DEF dosing valve on.
2. 1000 to 1500 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:
Derate 25%

VERIFICATION:
Parked regen

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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