DESCRIPTION:
Selective Catalyst Reduction (SCR) outlet temperature high.

MONITORED PARAMETER:
SCR outlet temperature.

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:
1. Derate 25%.
2. 30 seconds shut down.

VERIFICATION:
SCR efficiency test.

NOTE: If code 3246-15 active, fix that first.

PROBABLE CAUSES:
1. Inspect all connectors and wiring upstream of the ACM (SCR inlet temp, ATD harness 10-pin connector, VIH 47-pin connector, and ECM 120-pin connector).
2. SCR outlet temperature sensor.
3. SCR outlet temperature sensor connector/harness.