SPN 4374 FMI 19 is the Detroit Diesel diagnostic trouble code set when the DEF system is not being controlled as expected on DD Series (EPA 2007-current) engines. This 2-page troubleshooting sheet lists the fault definition, the relevant monitor or note data, and a numbered diagnostic routine that ends in the correct wiring or component repair. It is drawn from TruckFaultCodes.com (© 2017) and applies to the GHG14 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — DEF dosing control |
| Suspect parameter (SPN) | SPN 4374 |
| Failure mode (FMI) | DEF system not controlled as expected |
| Emissions calibration | GHG14 |
| Verification | SCR ADS self-check |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format / language | PDF / English |
SPN 4374 FMI 19 table of contents
After ruling out other active faults, the DEF pump harness and connector are inspected, then an SCR ADS self-check is run. The sheet lists the readings the test must meet: DEF pump speed greater than 750 rpm and less than 1800 rpm, and DEF pressure greater than 9000 mbar and less than 11000 mbar (130-160 psi). Values outside that window call for replacing the DEF pump; if the fault returns after a five-minute idle, Detroit Customer Support is contacted at 800-445-1980.
- Fault code header and log-file note
- Troubleshooting steps 1 to 6
- Acceptable DEF pump speed and pressure ranges
- SCR ADS self-check verification
- DEF pump replacement and support escalation
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the closed-loop DEF dosing control on the SCR system. The SPN 4374 FMI 19 procedure applies to Detroit DD Series (EPA 2007-current) engines running the GHG14 calibration, and the same code index is cross-referenced under the Detroit Series 60 (DDEC VI, EPA 2007) fault-code set. For engine identification and warranty details, see the Detroit Diesel official site.
Who needs this 4374 FMI 19 manual
It is written for technicians judging whether the DEF dosing system is holding pressure and flow on Detroit DD Series engines. The published speed and pressure limits give a hard reference for pass and fail without a factory engineer on the phone.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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