SPN 1761 FMI 3 is the Detroit code raised when the DEF tank level sender reads a circuit failed high on the aftertreatment system, 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 3 |
| 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 3 — DEF tank level sensor circuit failed high
- 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 3 troubleshooting steps
Step 1 checks for the companion codes SPN 1761/3 and 3031/3. The pin-2 branch reads voltage against ground: any voltage present is a short to power toward Aftertreatment Control Module (ACM) pin 102, and a resistance above 5 ohms between pin 2 and ACM pin 102 is a broken wire; otherwise the sender is replaced per OEM literature. The pin-1 branch reads voltage against ground with the key on: above 3.00 volts is a short to power at ACM pin 109, 2.0-2.95 volts calls for sender replacement, and under 2.5 volts is an open wire to ACM pin 109.
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 3 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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