SPN 4363 FMI 3 is the Detroit Diesel diagnostic trouble code set when the SCR outlet temperature sensor circuit fails high 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 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 high |
| Emissions calibration | EPA10 / GHG14 |
| Dash lamps | MIL, CEL |
| Engine reaction | 25% derate |
| Verification | engine idle (1 minute) |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| File size | 0.3 MB |
| Format / language | PDF / English |
SPN 4363 FMI 3 table of contents
The SCR outlet temperature sensor connector is disconnected and inspected, then the resistance across pins 1 and 2 is compared to the sensor chart. If that is in range, voltage checks follow: greater than 3 volts on pin 2 indicates a short to power toward ACM pin 78, while a reading under 2.75 volts points to an open or high-resistance wire. Voltage present on pin 1 shows a short to power toward ACM pin 77; no voltage means the pin-77 wire is open.
- Fault code header and description (always-enabled monitor)
- Troubleshooting steps 1 to 6
- Sensor resistance check (pins 1 and 2)
- Pin-2 and pin-1 voltage diagnosis
- Short-to-power versus open-circuit repair
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 3 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 3 manual
It helps technicians decide between a failed sensor, a short to power and an open circuit on the SCR outlet temperature signal of Detroit DD Series trucks. The voltage thresholds pinpoint the exact ACM pin and wire to repair.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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