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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3556 FMI 18 (ACM) Diesel Oxidation Catalyst Outlet Temperature Low (Low Temp Regeneration)

DESCRIPTION:
This code sets when the exhaust temperature dos not increase above the modeled threshold when the low temp regeneration is enabled.

MONITORED PARAMETER:
Diesel oxidation catalyst (DOC) outlet temperature sensor.

TYPICAL ENABLING CONDITIONS:
1. Low temperature regeneration enabled.
2. 1100 to 2050 rpm.
3. 100% engine load.

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
20 seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 10%

VERIFICATION:
Regeneration

PROBABLE CAUSES:
1. Inspect entire exhaust & fuel system for leaks.
2. Inspect all 3 temperature sensors on the DPF/DOC system.
3. Inspect fuel line from doser block assy to the doser injection valve for kinks.
4. Remove the doser injection valve and coolant block from turbo outlet and inspect for carbon buildup. If present, replace the doser injector valve.
5. Clean the doser fuel lines.
6. Perform stationary regen.
7. Replace the HC doser block assy.

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