SPN 4363 FMI 20 is the Detroit Diesel diagnostic trouble code set when the SCR outlet temperature sensor reads inlet-low and outlet-high on DD Series (EPA 2007-current) engines. This 3-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 EPA10 / GHG14 emissions calibration.
Official document details
| Brand | Detroit Diesel |
|---|---|
| Model coverage | DD Series engines (EPA 2007-current) |
| System / group | DTCs — SCR outlet temperature sensor |
| Suspect parameter (SPN) | SPN 4363 |
| Failure mode (FMI) | SCR outlet temp sensor, inlet low / outlet high |
| Emissions calibration | EPA10 / GHG14 |
| Verification | high-idle regeneration |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 3 |
| File size | 0.4 MB |
| Format / language | PDF / English |
SPN 4363 FMI 20 table of contents
The technician monitors the four aftertreatment temperatures – DOC outlet, DPF outlet, SCR inlet and SCR outlet – looking for the odd reading (for example, three near 93.3C/200F and one at -40C/-40F). The suspect SCR inlet and outlet temperature sensors are then unplugged, inspected for pin damage and checked against the resistance chart. A high-idle regeneration is run and the temperatures re-checked, replacing whichever sensor reads out of range.
- Fault code header
- Monitored ATD temperatures (DOC, DPF, SCR inlet and outlet)
- Troubleshooting steps 1 to 10
- SCR inlet and outlet sensor resistance checks
- High-idle regeneration re-check
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR inlet and outlet exhaust temperature sensors. The SPN 4363 FMI 20 procedure applies to Detroit DD Series (EPA 2007-current) engines running the EPA10 / 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 SPN 4363 FMI 20 manual
It is aimed at technicians untangling correlated temperature faults across the aftertreatment device on Detroit DD Series trucks. Comparing all four sensor readings side by side is the fastest way to spot the single sensor that is drifting.
The full 3-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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