tank level sensor DTCs is the Detroit high-side circuit fault for the circuit (SPN 1761, FMI 3) that has failed high, 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 — 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
tank level sensor DTCs troubleshooting steps
Step 1 checks whether SPN 1761/3 and 3031/3 are both present; if so you disconnect the sender, inspect the connector for bent, spread or corroded pins, then turn the ignition on and read the voltage on pin 2 versus ground. Voltage present points to a short to power up to ACM pin 102, while a resistance over 5 ohms to that pin is a wire fault. If only 1761/3 is present, the second branch measures pin 1 against ground: above 3.00 volts is a short to power at ACM pin 109, a reading of 2.0-2.95 volts sends you to OEM literature for replacement, and below 2.5 volts is an open wire to 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 tank level sensor DTCs 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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