SPN 5395 FMI 15 is the Detroit DD Series fault code for Fuel Quantity Data Valid But Above Normal Operating Range — Least Severe Level, and this five-page sheet walks the full diagnostic tree. Published on TruckFaultCodes.com (Copyright 2017), it monitors injector quantity under steady-state drive with no regen and sets a 25% derate.
Official document details
| Brand | Detroit |
| Model coverage | DD13, DD15, DD16 (DD Series, EPA 2007-Current) and Series 60 DDEC VI |
| System/Group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | SPN undefined FMI undefined |
| Source | TruckFaultCodes.com, Copyright 2017 |
| Pages | 5 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code description (SPN and FMI)
- Monitored parameter and verification
- Intake manifold temperature checks
- EGR delta P sensor and EGR system inspection
- Exhaust, intake and charge air cooler checks
- Troubleshooting steps 1 to 16
Applicable truck models
This sheet covers Detroit DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) range, with cooler removal split by model, and is cross-referenced on the Series 60 DDEC VI platform. For OEM-level service literature and engine coverage, see the official Detroit Diesel website.
SPN 5395 FMI 15 diagnostic sequence
The tree starts at the intake manifold temperature sensor — a reading above 65°C (150°F) or damaged pins condemn the sensor — then compares intake manifold pressure to baro within 0.4 psi. It checks EGR delta P voltage (pin 109) against 0.55 to 0.83 volts, inspects the EGR system, hot pipe and crossover tube for build-up, and replaces the EGR cooler when blocked. Later steps hunt for exhaust and air-intake leaks, leak-check the charge air cooler, and finish with a high idle regeneration and a call to the Customer Support Center.
Who needs this SPN 5395 FMI 15 manual
Technicians diagnosing a steady-cruise derate with no obvious sensor code lean on this 5395 FMI 15 manual to work the intake, EGR and charge-air path in the correct order.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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