SPN 4363 FMI 0 is the Detroit Diesel diagnostic trouble code set when the SCR outlet temperature reads high on DD Series (EPA 2007-current) engines. This 1-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 |
| Suspect parameter (SPN) | SPN 4363 |
| Failure mode (FMI) | SCR outlet temperature high |
| Emissions calibration | EPA10 / GHG14 |
| Dash lamps | MIL, CEL |
| Engine reaction | 25% derate |
| Verification | SCR efficiency test |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format / language | PDF / English |
SPN 4363 FMI 0 table of contents
As with the inlet code, SPN 3246/FMI 15 (DPF outlet over-temperature) is checked first and given priority. Parameter AS096 SCR outlet temperature voltage is monitored while wiggle-testing the harness for sudden voltage changes. If the signal is stable, the SCR outlet temperature sensor is disconnected, the connector inspected for bent, spread or corroded pins, and the sensor replaced when the pins are good.
- Fault code header and description (non-regen monitor)
- Cross-check against DPF outlet over-temperature
- Troubleshooting steps 1 to 5
- AS096 voltage wiggle test
- Sensor pin inspection and replacement
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR outlet exhaust temperature circuit. The SPN 4363 FMI 0 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 4363 FMI 0 manual
It helps technicians confirm whether a high SCR outlet temperature is real or a harness fault on Detroit DD Series trucks. The live AS096 voltage check keeps a good sensor from being replaced for an intermittent wire.
The full 1-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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