DESCRIPTION:This fault code sets when the Aftertreatment Control Module (ACM) detects that the Selective Catalyst Reduction (SCR) outlet temperature sensor reading and SCR outlet model temperature is greater than 70°C (158°F).
MONITORED PARAMETER:SCR outlet temperature.
TYPICAL ENABLING CONDITIONS:1. Exhaust flow greater than 600 Kg/hr.2. Coolant temperature greater than 60°C (140°F).3. Non-regen mode.
MONITOR SEQUENCE:None
EXECUTION FREQUENCY:Continuous when enabling conditions met.
TYPICAL DURATION:2 seconds
DASH LAMPS:MIL
ENGINE REACTION:Derate 25%
VERIFICATION:SCR efficiency test.
NOTE: Monitor the DOC outlet, DPF outlet, SCR inlet, and SCR outlet temps. If they are no close together, the one that is off is the failure sensor.
PROBABLE CAUSES:1. Check all 4 temp sensors mentioned above at the connections and harness.2. SCR inlet temp sensor.3. SCR outlet temp sensor.