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Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3226 FMI 13 (ACM) Selective Catalyst Reduction Outlet NOx Sensor Signal Not Available

DESCRIPTION:
Selective catalyst reduction (SCR) outlet NOx sensor signal not available.

MONITORED PARAMETER:
SCR outlet NOx sensor signal.

TYPICAL ENABLING CONDITIONS:
Always enabled

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Always enabled

TYPICAL DURATION:
Two seconds

DASH LAMPS:
MIL

VERIFICATION:
Engine Idle: One minute.

NOTE: If fault occurred during high idle regeneration, clear fault and release vehicle.

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

PROBABLE CAUSES:
1. SCR outlet NOx sensor.
2. SCR outlet NOx sensor connector/harness.
3. ACM2 (engine computer) failure.

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