SPN 4363 FMI 8 is the Detroit Diesel diagnostic trouble code set when a signal spike is seen on the SCR inlet temperature sensor of 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 inlet temperature signal |
| Suspect parameter (SPN) | SPN 4363 |
| Failure mode (FMI) | SCR inlet temperature signal spike |
| Emissions calibration | EPA10 / GHG14 |
| Verification | harness wiggle test |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 2 |
| File size | 0.3 MB |
| Format / language | PDF / English |
SPN 4363 FMI 8 table of contents
The note explains this code flags a sudden temperature shift on the SCR inlet temperature sensor, most often from intermittent wiring. After repairing any active FMI 3 or 4 on the same circuit, the technician monitors SCR inlet temperature at pin 76 while wiggle-testing the harness for voltage spikes, then isolates and repairs any chafed or corroded section. A sensor resistance check across pins 1 and 2 and a drag test of every terminal with the J-48476 and J-47410 kits complete the diagnosis.
- Fault code header and intermittent-wiring note
- Troubleshooting steps 1 to 7
- Wiggle test for voltage spikes (pin 76)
- Sensor resistance check
- Terminal drag test with J-48476 and J-47410
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR inlet exhaust temperature sensor circuit. The SPN 4363 FMI 8 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 8 manual
It targets technicians chasing an intermittent SCR inlet temperature spike on Detroit DD Series trucks, where a steady sensor still logs a fault. The wiggle-test and drag-test method is built to catch the loose terminal or chafe that a static check would miss.
The full 2-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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