Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 4363
FMI: 20
Description: SCR Temperature Drift – Inlet Low/Outlet High
Troubleshooting:
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:
Exhaust flow greater than 600 Kg/hr, coolant temperature greater than 60°C (140°F). Nonregen
mode.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
MIL
ENGINE REACTION:
Derate 25%
VERIFICATION:
SCR efficiency test.
POSSIBLE CAUSES:
1. Spread pins.
2. Damaged pins.
3. Corroded pins.
4. Fretting pins.
5. Faulty SCR outlet temperature sensor.
Page
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 4364
FMI: 1
Description: SCR NOx Conversion Efficiency Very Low
Troubleshooting:
DESCRIPTION:
This Code Sets When the Aftertreatment Control Module (ACM) Detects Poor Selective
Catalyst Reduction (SCR) NOx Conversion Efficiency.
MONITORED PARAMETER:
SCR inlet NOx sensor and SCR outlet NOx sensor.
TYPICAL ENABLING CONDITIONS:
Diesel Exhaust Fluid (DEF) Dosing Enabled, 1000 to 2100 rpm, 15 to 100% Load.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
30 minutes
DASH LAMPS:
MIL
ENGINE REACTION:
25% derate
VERIFICATION:
Parked SCR efficiency test.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 4364
FMI: 17
Description: SCR NOx Conversion Efficiency
Troubleshooting:
DESCRIPTION:
This Code Sets When the Aftertreatment Control Module (ACM) Detects Poor Selective
Catalyst Reduction (SCR) NOx Conversion Efficiency.
MONITORED PARAMETER:
SCR inlet NOx sensor and SCR outlet NOx sensor.
TYPICAL ENABLING CONDITIONS:
Diesel Exhaust Fluid (DEF) Dosing Enabled, 1000 to 2100 rpm, 15 to 100% Load.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
30 minutes
DASH LAMPS:
MIL
ENGINE REACTION:
25% derate
VERIFICATION:
Parked SCR efficiency test.
POSSIBLE CAUSES:
1. Contaminated DEF
2. Incorrect concentration of urea in the DEF
3. Biased NOx sensor
4. Excessive DEF build-up in the exhaust
5. Improper DPF maintenance
6. Over temp aftertreatment
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 4374
FMI: 0
Description: Under Pressurized Diesel Exhaust Fluid System
Troubleshooting:
DESCRIPTION:
This Code Sets When the Diesel Exhaust Fluid (DEF) pump speed is higher than normal for a
given DEF pressure.
MONITORED PARAMETER:
DEF pump speed, DEF pressure.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
Continuous until resolved.
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 25%
VERIFICATION:
SCR ADS self-check
POSSIBLE CAUSES:
1. Restriction in the DEF line between the DEF tank and the DEF pump.
2. Restriction in the DEF line between the DEF pump and the DEF dosing unit.
3. Air in the DEF line between the DEF tank and the DEF pump.
4. Restriction in the DEF pump.
5. Failed DEF pump.