Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 4374
FMI: 14
Description: DEF PNV SRH Loop Error (Pump Speed High)
Troubleshooting:
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. 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.
Make: Detroit
Engine: DD15 GHG17 (2017 & Newer)
PID: N/A
SPN: 4374
FMI: 1
Description: Over Pressurized DEF System
Troubleshooting:
DESCRIPTION:
Over pressurized Diesel Exhaust Fluid (DEF) system.
MONITORED PARAMETER:
DEF pump speed vs. DEF pressure.
TYPICAL ENABLING CONDITIONS:
DEF Pump enabled OR On-Off-Cycle request.
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Continuous when enabling conditions met.
TYPCIAL DURATION:
2 minutes
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
None
VERIFICATION:
ADS self-check
POSSIBLE CAUSES:
1. Damaged pins.
2. Bent pins.
3. Spread pins.
4. Corroded pins.
5. Unseated pins.
6. Faulty DEF return line.
7. Faulty DEF dosing unit.
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: 3363
FMI: 5
Description: Diesel Exhaust Fluid Coolant Valve Circuit Failed Open
Troubleshooting:
DESCRIPTION:
Diesel exhaust fluid (DEF) coolant valve circuit failed open.
MONITORED PARAMETER:
DEF coolant valve.
TYPICAL ENABLING CONDITIONS:
Always enabled
MONITOR SEQUENCE:
None
EXECUTION FREQUENCEY:
Always enabled
TYPCIAL DURATION:
2 seconds
DASH LAMPS:
1. MIL
2. CEL
ENGINE REACTION:
Derate 10%
VERIFICATION:
Engine idle: 1 minute.
POSSIBLE CAUSES:
1. Bent pins.
2. Spread pins.
3. Corroded pins.
4. Voltage out of range.
5. Faulty wiring.
6. Faulty DEF coolant valve.