This inlet pressure sensor DTCs guide is the Detroit DD Series SPN 3609 FMI 4 fault-code procedure for EPA07 engines, where the diesel particulate filter inlet circuit reads failed low. It follows the resistance and voltage checks performed at the Motor Control Module.
Official document details
| Brand | Detroit |
| Model coverage | Detroit DD Series (EPA 2007-Current) |
| System / group | DD Series / DTCs |
| SPN | 3609 |
| FMI | 4 |
| Condition | inlet pressure sensor circuit failed low |
| Emissions level | EPA07 |
| Source | Detroit Power Service Literature |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
inlet pressure sensor DTCs checks
The routine starts by checking for SPN 3610/FMI 4, which flags an open between MCM pin 85 and the diesel particulate filter sensor. You then disconnect the connector and measure resistance across pins 2 and 3, check for 4.75 volts on the supply, and reference battery ground by the starter to separate an open feed, a shorted wire, or a component that must be replaced under the EPA07 pressure sensor removal routine.
- Fault description: inlet circuit failed low on EPA07 engines
- Step 1 – Check for multiple codes (SPN 3610/FMI 4)
- Steps 2 to 3 – Disconnect connector, resistance across pins 2 and 3
- Steps 4 to 6 – Supply voltage and battery ground checks
- Steps 7 to 9 – MCM 120-pin connector isolation and repair
Applicable truck models
This EPA07 fault code applies to Detroit DD Series heavy-duty diesel engines managed by a Motor Control Module. Removal steps cite Detroit Power Service Literature; confirm the pin numbers against the engine wiring diagram on the official Detroit Diesel website.
Who needs this inlet pressure sensor DTCs manual
Diesel technicians and workshop owners servicing early EPA07 Detroit engines use this document to trace the diesel particulate filter inlet fault to a wire, a connector, or the component itself. A diesel diagnostic tool and multimeter are needed.
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