SPN 3936 FMI 18 is the Detroit diesel fault code documented in this diesel particulate filter pressure out of range low troubleshooting guide for DD Series (EPA 2007-Current) engines. This 3-page PDF explains the monitored condition, the enabling parameters and the step-by-step checks a technician follows to confirm and repair the code. It is part of the Detroit DD Series diagnostic trouble code (DTC) library and follows the standard monitored-parameter, enabling-conditions and troubleshooting-step layout used across the Detroit fault-code set.
Official document details
| Brand | Detroit (Detroit Diesel) |
|---|---|
| Model coverage | DD Series (EPA 2007-Current); cross-referenced for Series 60 (DDEC VI – EPA 2007) |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| Fault code | FMI 18 under SPN 3936 — Diesel Particulate Filter Pressure Out Of Range Low |
| Emissions level | EPA10, GHG14 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
SPN 3936 FMI 18 troubleshooting steps
- Visually inspect the entire exhaust system for signs of leaks or damage and repair as necessary.
- Connect the diesel diagnostic tool and use the SCR Catalyst voltage service routine to monitor DOC inlet pressure (pin 87) and DPF outlet pressure (pin 72) with the key on and engine off.
- A voltage of 0.44 to 0.56 volts is in range; above 0.56 volts, replace the suspect pressure sensor.
- Below 0.44 volts, inspect the connections between the suspect sensor and the Aftertreatment Control Module (ACM) for bent, spread or corroded pins.
- Inspect the DOC and DPF pressure sensor tubes and elbows for leaks, kinks or blockages, then capture a log file at idle, high-idle regeneration and parked regeneration and contact the Customer Support Center (800-445-1980).
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers the DOC inlet and DPF outlet pressure sensors and their ACM wiring. The procedure is published in Detroit Power Service Literature and drawn from the Detroit diesel fault-code set; always confirm the latest revision through the official Detroit engine support site.
Who needs this SPN 3936 FMI 18 manual
Fleet technicians and workshop owners use this guide to diagnose an out-of-range-low DPF pressure signal across the sensors, tubes and ACM connections. Reading the full procedure before touching the harness keeps the diagnosis on the documented path and avoids replacing good parts.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Detroit Diesel Reports 6.3
Detroit Reprogramming Station (DDRS) 7.11
DDDL Backdoor Password: A Comprehensive Guide
