Detroit fault code 3216 FMI 2 EPA10 is the TruckFaultCodes.com diagnostic sheet for the SCR Inlet NOx Sensor – Drift condition on Detroit DD-series engines. This 2 pages reference lists the fault identification, monitored conditions where shown, and the step-by-step troubleshooting the technician follows in the shop.
Official document details
| Brand | Detroit |
|---|---|
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / Group | DD Series (EPA 2007-Current) / DTCs |
| Publication no. | Not printed; TruckFaultCodes.com reference |
| Year / Revision | 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (SPN 3216 / FMI 2)
- Description and enabling conditions
- EGR and charge-air inspection
- Idle speed balance and ATS checks
- High-idle regeneration and log submission
3216 FMI 2 EPA10 troubleshooting steps
The sheet monitors Engine In NOx. Enabling conditions are fuel mass at zero, DPF outlet temperature above 200 C, battery voltage above 10 V and engine speed between 500 and 2100 rpm for more than 30 seconds. Typical duration is 5 seconds, the dash lamps are MIL, and the engine reaction is none.
The two-page routine first repairs any Exhaust Gas Recirculation (EGR) faults, then inspects the air inlet, Charge Air Cooler (CAC) and EGR piping for leaks or damage. An idle speed balance test checks for a faulty injector and the Aftertreatment System (ATS) is examined for exhaust leaks. With the diesel diagnostic tool connected, the Diesel Exhaust Fluid (DEF) metering unit dosing valve is disconnected, a high-idle regeneration is performed and the log file is submitted to the Detroit Customer Support Center at 800-445-1980.
Applicable truck models
This sheet applies to Detroit DD-series diesel engines (the DD13, DD15 and DD16 family) built under the EPA 2007-Current emissions platform, in its EPA10 calibration. Engine and emissions specifications should always be confirmed against the vehicle build; full engine information is published on the Detroit Diesel official site.
Who needs this 3216 FMI 2 EPA10 manual
EPA10 Detroit technicians use this sheet when the inlet NOx sensor signal has drifted, working the EGR and aftertreatment path before condemning the sensor. It is a quick bench reference rather than a full workshop manual, so the named removal steps still route back to Power Service Literature and, where escalation is needed, to the Detroit Customer Support Center.
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