SPN 1761 FMI 2 is the Detroit code for a DEF tank level sender circuit whose data is erratic, intermittent or incorrect, and this sheet walks the harness and Aftertreatment Control Module (ACM/ACM2.1) checks that isolate it. Follow it before replacing the sender.
Official document details
| Brand | Detroit |
| Model coverage | DD13, DD15, DD16 (EPA 2007-current) |
| System / group | DEF / SCR aftertreatment — level sensor circuit |
| Fault code | SPN 1761 / FMI 2 |
| Publication no. | Not printed on sheet |
| Year / revision | Reference dated 2017 |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault header: SPN 1761 / FMI 2 — DEF tank level sensor circuit data erratic
- Monitored parameter and verification conditions
- Steps to inspect the sender connector for bent, spread or corroded pins
- Voltage and resistance checks at ACM pins 102 and 109
- Wire-repair versus sender-replacement decision
SPN 1761 FMI 2 troubleshooting steps
Step 1 checks whether SPN 1761/3 and 3031/3 are both present. On the pin-2 branch, voltage against ground indicates a short to power up to Aftertreatment Control Module (ACM2.1) pin 102, and a resistance over 5 ohms between pin 2 and ACM2.1 pin 102 is a wire fault; otherwise the sender is replaced. On the pin-1 branch, more than 3.00 volts is a short to power at ACM2.1 pin 109, 2.0-2.95 volts points to sender replacement, and under 2.5 volts is an open wire to pin 109. Every branch starts by inspecting the sender connector for bent, spread or corroded pins.
Applicable truck models
This procedure covers Detroit DD-series engines — DD13, DD15 and DD16 on the EPA 2007-current platform with SCR aftertreatment — and shares its SPN/FMI structure with related Series 60 DDEC VI applications. Confirm the emissions calibration (EPA07, EPA10 or GHG14) before probing any pin. For engine serial-number and calibration confirmation, use the Detroit Diesel official support site.
Who needs the SPN 1761 FMI 2 manual
Diesel technicians and aftertreatment specialists use this sheet to test the DEF tank temperature/level sender wiring, distinguish a short or open from a failed sender, and identify the exact ACM pins before ordering parts.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download. Source: Detroit SPN/FMI fault-code reference (© 2017); circuit values are measured with the Detroit Diesel Diagnostic Link (DDDL) and a calibrated multimeter.
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