SPN 4360 FMI 20 is the Detroit Diesel diagnostic trouble code set when the SCR inlet temperature sensor drifts high while still in range 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 inlet temperature sensor |
| Suspect parameter (SPN) | SPN 4360 |
| Failure mode (FMI) | SCR inlet temp sensor drift high in range |
| Emissions calibration | EPA10 / GHG14 |
| Dash lamps | MIL |
| Verification | parked regeneration |
| Source / copyright | TruckFaultCodes.com, © 2017 |
| Pages | 1 |
| File size | 0.2 MB |
| Format / language | PDF / English |
SPN 4360 FMI 20 table of contents
This concise sheet has the technician disconnect the SCR inlet temperature sensor and inspect its harness connector for bent, spread or corroded pins. If pin damage is found it is repaired; if the pins are sound, the sensor is replaced. The description also lists the enabling conditions the monitor needs to run – non-regen operation, coolant above 60C and exhaust mass flow above 600 kg/h.
- Fault code header and description
- Enabling conditions (coolant and mass-flow thresholds)
- Troubleshooting steps 1 to 2
- Sensor harness pin inspection
- Sensor replacement decision
Applicable truck models
This sheet is part of the DD Series diagnostic trouble code library and addresses the SCR inlet exhaust temperature sensor. The SPN 4360 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 4360 FMI 20 manual
It is written for technicians confirming an in-range drift fault on the SCR inlet temperature sensor of Detroit DD Series trucks. Knowing the enabling conditions explains why the code only sets under load, saving needless harness chasing.
The full 1-page PDF is available in the DiagTechPro manuals library; a free account is required to download.
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