SPN 4363 FMI 4 is the Detroit Diesel diagnostic trouble code set when the SCR outlet temperature sensor circuit fails low 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 sensor circuit |
| Suspect parameter (SPN) | SPN 4363 |
| Failure mode (FMI) | SCR outlet temp sensor circuit failed low |
| Emissions calibration | EPA10 / GHG14 |
| Dash lamps | MIL, CEL |
| Engine reaction | 25% derate |
| Verification | engine idle (1 minute) |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format / language | PDF / English |
SPN 4363 FMI 4 table of contents
With the ignition off, the SCR outlet temperature sensor connector is disconnected and inspected for bent, spread or corroded pins. The ACM 120-pin connector is then unplugged and the resistance measured between pin 2 on the harness side of the sensor connector and ground. A reading under 1K ohms calls for repairing the wire between pin 2 and ACM pin 78; a higher reading means the sensor itself is replaced.
- Fault code header and description (always-enabled monitor)
- Troubleshooting steps 1 to 5
- Harness pin inspection
- Resistance-to-ground decision (wire versus sensor)
- Engine-idle verification
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR outlet exhaust temperature sensor circuit. The SPN 4363 FMI 4 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 4 manual
It is written for technicians resolving a low-side SCR outlet temperature circuit fault and a 25% derate on Detroit DD Series trucks. The single-page flow separates a grounded wire from a failed sensor with one resistance measurement.
The full 1-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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