This SPN 3609 FMI 3 document is a Detroit DD Series fault-code procedure for the DOC inlet pressure sensor circuit failed high condition on EPA10 and GHG14 engines. It lays out the voltage and resistance measurements taken at the Aftertreatment Control Module.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / group | DD Series / DTCs |
| SPN | 3609 |
| FMI | 3 |
| Condition | DOC inlet pressure sensor circuit failed high |
| Emissions level | EPA10 and GHG14 |
| Source | Detroit Power Service Literature |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3609 FMI 3 troubleshooting steps
The guide branches on whether SPN 3610/FMI 3 and SPN 3509/FMI 3 are also present, which indicate a short to power or an open at ACM pin 88. After disconnecting the sensor and switching the ignition on, you measure voltage on sensor pin 2 to detect a short to power, then measure resistance to ACM pin 87 to isolate a damaged wire or a failed sensor that must be replaced per the EPA07 pressure sensor removal routine.
- Fault description: DOC inlet pressure sensor circuit failed high
- Step 1 – Check for multiple codes (SPN 3610/FMI 3, SPN 3509/FMI 3)
- Steps 2 to 4 – Disconnect sensor, ignition on, voltage on pin 2
- Steps 5 to 7 – ACM 120-pin connector and pin 87 resistance
- Replace sensor per Power Service Literature
Applicable truck models
This fault code applies to Detroit DD Series heavy-duty diesel engines — the DD13, DD15 and DD16 — built to the EPA10 and GHG14 emissions calibration with an Aftertreatment Control Module. Removal steps reference Detroit Power Service Literature, so verify the wiring against the engine build on the official Detroit Diesel website.
Who needs this SPN 3609 FMI 3 manual
Diesel technicians and workshop owners diagnosing a high-side DOC pressure fault on a Detroit engine rely on this document to confirm whether the wiring or the sensor has failed. A diesel diagnostic tool and multimeter are required.
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