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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3226 FMI 4 (ACM) Selective Catalyst Reduction Outlet NOx Sensor Circuit Failed Low

DESCRIPTION:
This code sets when there is a short to ground on the SCR outlet NOx circuit between the sensor and CPU.

MONITORED PARAMETER:
SCR outlet NOx sensor.

TYPICAL ENABLING CONDITIONS:
Dewpoint enabled

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
None

VERIFICATION:
Parked regen

NOTE: If occurrence counter 5 or less, clear codes and return vehicle to customer.

PROBABLE CAUSES:
SCR outlet NOx sensor.

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