DESCRIPTION:
This fault code sets when the Aftertreatment Control Module (ACM) detects a momentary abnormal Selective Catalyst Reduction (SCR) outlet temperature reading.

MONITORED PARAMETER:
Selective Catalyst Reduction outlet temperature sensor.

TYPICAL ENABLING CONDITIONS:
Non-regen mode

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
2 seconds

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
None

VERIFICATION:
SCR efficiency test.

NOTE: This fault indicates that the ACM has detected a sudden temperature switch on the SCR inlet temperature sensor. Most likely cause is wiring failure.

NOTE: If codes 4363-3 or 4363-4 are active, fix those first.

PROBABLE CAUSES:
1. Check all SCR sensor wiring for looseness, breaks, rubs, etc…
2. SCR inlet temperature sensor failure.