SPN 3871 FMI 5 is the Detroit diesel fault code documented in this transmission speed sensor circuit failed open troubleshooting guide for DD Series (EPA 2007-Current) engines. This 2-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 5 under SPN 3871 — Transmission Speed Sensor Circuit Failed Open |
| Emissions level | GHG14 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
SPN 3871 FMI 5 troubleshooting steps
- The code reports the transmission speed sensor 4 04 or 3 13 circuit failed open.
- If the Common Powertrain Controller (CPC4) was recently reprogrammed, confirm the transmission speed sensor (TSS) parameters match the vehicle application.
- Determine whether the TSS is hardwired or transmitted over J1939, and follow the correct path for each.
- Disconnect the TSS harness connector (see OEM literature for location) and inspect for bent, spread or corroded pins.
- Disconnect the CPC4 #3 or #4 connector and measure resistance to the TSS+ and VSS- harness; more than 5 ohms means repair the wire, otherwise refer to OEM TSS diagnostics.
Applicable truck models and engines
This document applies to Detroit DD Series (EPA 2007-Current) engines and covers the transmission speed sensor (TSS) circuit between the sensor and the CPC4. 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 3871 FMI 5 manual
Fleet technicians and workshop owners use this guide to confirm an open TSS circuit and split a wiring repair from a parameter or OEM sensor issue. 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
