Detroit DD15 GHG14 (2014-16) Fault Code: SPN 4363 FMI 20 (ACM) SCR Temperature Drift – Inlet Low/Outlet High
DESCRIPTION:
This fault code sets when the Aftertreatment Control Module (ACM) detects that the Selective Catalyst Reduction (SCR) outlet temperature sensor reading and SCR outlet model temperature is greater than 70°C (158°F).
MONITORED PARAMETER:
SCR outlet temperature.
TYPICAL ENABLING CONDITIONS:
1. Exhaust flow greater than 600 Kg/hr.
2. Coolant temperature greater than 60°C (140°F).
3. Non-regen mode.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCY:
Continuous when enabling conditions met.
TYPICAL DURATION:
2 seconds
DASH LAMPS:
MIL
ENGINE REACTION:
Derate 25%
VERIFICATION:
SCR efficiency test.
NOTE: Monitor the DOC outlet, DPF outlet, SCR inlet, and SCR outlet temps. If they are no close together, the one that is off is the failure sensor.
PROBABLE CAUSES:
1. Check all 4 temp sensors mentioned above at the connections and harness.
2. SCR inlet temp sensor.
3. SCR outlet temp sensor.
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