Detroit DD13 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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Allison Transmission – WTEC 2 MD/HD/B SERIES TRANSMISSIONS
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