This Cummins 3186 fault code document is a troubleshooting procedure for abnormal tachograph output shaft speed update rate on SAE J1939 multiplexed systems. It explains how the Cummins ECM receives component messages from an OEM VECU or transmission ECU, then outlines checks for configuration, wiring, connectors, calibration, and fault clearing.
Official Cummins 3186 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, with associated coverage also listing ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Tachograph Output Shaft Speed Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting steps Last Modified: 04-Jan-2011 |
| Pages | 13 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 3186 – Tachograph Output Shaft Speed – Abnormal Update Rate
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check for ECM communication with INSITE™ electronic service tool
- Guided Step 3 – Check the OEM VECU and engine ECM for proper multiplexing configuration
- Guided Step 4B – Check for an open or short circuit in the J1939 data link harness
- Guided Step 5 – Check the OEM harness
- Guided Step 5C – Check for a short circuit in the ECM J1939 data link harness
- Guided Step 5D – Check for an inactive fault code
- Guided Step 6 – Check ECM calibration and clear fault codes
- Guided Step 6B – Disable the fault code
Applicable truck models
This file applies to Cummins CM2250 engine platforms shown in the procedure, especially ISB6.7 CM2250 for bulletin 4022254. The associated procedures table also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250, with diagnosis centered on ECM communication, OEM VECU multiplexing configuration, SAE J1939 data link resistance checks, OEM harness inspection, and ECM calibration code verification. For manufacturer information, visit Cummins official website.
Who needs this Cummins 3186 fault code manual
This manual is useful for diesel technicians, fleet workshops, and diagnostic tool users troubleshooting SPN 1623 FMI 9/9 with an amber CHECK ENGINE lamp or MIL. It helps confirm whether the issue is caused by OEM VECU source addressing, multiplexed component enables, a service data link problem, an ECM J1939 harness fault, or an ECM calibration update.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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