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

MONITORED PARAMETER:
SCR inlet 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 inlet NOx sensor.
2. SCR inlet NOx sensor connector/harness.
3. ACM2 (engine computer) failure.