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. MIL2. 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....

DESCRIPTION:SCR NOx conversion efficiency very low. MONITORED PARAMETER:SCR NOx conversion efficiency. TYPICAL ENABLING CONDITIONS:1. DEF dosing valve on.2. 1000 to 1500 rpm.3. 15 to 100% load. MONITOR SEQUENCE:None EXECUTION FREQUENCY:Continuous when enabling conditions met. TYPICAL DURATION:30 minutes DASH LAMPS:MIL ENGINE REACTION:Derate 25% VERIFICATION:Parked regen NOTE: If any 3364-xx codes present, fix those first. PROBABLE CAUSES:1. DEF tank contaminated (fuel, water, etc…).2. DEF pressure sensor failure.3. DEF pressure sensor connector/harness.4. Perform stationary regen.5. DEF air supply lines cracked/leaked/kinked.

DESCRIPTION:This code sets when the Aftertreatment Control Module (ACM) detects that the Selective Catalyst Reduction (SCR) NOx conversion efficiency is low. MONITORED PARAMETER:1. SCR inlet NOx sensor.2. SCR outlet NOx sensor. TYPICAL ENABLING CONDITIONS:1. Diesel Exhaust Fluid (DEF) dosing enabled.2. 1000 to 2100 rpm.3. 15 to 100% load. MONITOR SEQUENCE:None EXECUTION FREQUENCY:Continuous when enabling conditions met. TYPICAL DURATION:30 minutes DASH LAMPS:MIL ENGINE REACTION:None VERIFICATION:Parked regeneration NOTE: If any 3364-xx codes present, fix those first. PROBABLE CAUSES:1. DEF tank contaminated (fuel, water, etc…).2. DEF pressure sensor failure.3. DEF pressure sensor connector/harness.4. Perform stationary regen.5. DEF air supply lines cracked/leaked/kinked.

DESCRIPTION:This code sets when the Diesel Exhaust Fluid (DEF) pump speed is higher than normal for a given DEF pressure. MONITORED PARAMETER:1. DEF Pump Speed.2. DEF Pressure. MONITOR SEQUENCE:None EXECUTION FREQUENCY:Continuous when enabling conditions met. TYPICAL DURATION:Continuous until resolved. DASH LAMPS:1. MIL2. CEL ENGINE REACTION:Derate 25% VERIFICATION:SCR ADS Self-Check. NOTE: If any other codes are present, repair them first. PROBABLE CAUSES:1. Check connectors & wiring for: DEF dosing unit, DEF pump, Aftertreament Control Module, Chassis/ATS harness wiring/connector.2. Contaminated DEF tank (Fuel, water, etc…).3. Check DEF lines for blockages, kinks, cracks, etc…4. DEF doser unit inlet screen.5. DEF suction filter.6. Pressure...

DESCRIPTION:Over Pressurized Diesel Exhaust Fluid (DEF) System. MONITORED PARAMETER:DEF Pump Speed vs. DEF Pressure. TYPICAL ENABLING CONDITIONS:1. DEF pump enabled.2. On-Off-Cycle request. MONITOR SEQUENCE:None EXECUTION FREQUENCY:Continuous when enabling conditions met. TYPICAL DURATION:2 minutes DASH LAMPS:1. MIL2. CEL ENGINE REACTION:None VERIFICATION:ADS Self-Check. NOTE: If any other codes are present, repair them first. PROBABLE CAUSES:1. Check connectors & wiring for: DEF dosing unit, DEF pump, Aftertreament Control Module, Chassis/ATS harness wiring/connector.2. Contaminated DEF tank (Fuel, water, etc…).3. Doser unit failure.4. DEF return line failure.5. DEF tank header failure.