This Cummins 1657 fault document is a diagnostic troubleshooting sheet for Fault Code 1657 on Cummins ISB6.7 CM2350 engines. It explains SPN 1326 FMI 11/31, the amber lamp condition, cylinder 4 misfire detection, ECM actions, clearing conditions, shop talk notes, and step-by-step checks. The file is a 5-page PDF intended for service diagnosis, not a full engine overhaul manual.
Official Cummins 1657 fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) |
| System/Group | DTCs; Engine Misfire Cylinder 4 – Condition Exists |
| Publication no. | Not specified in the extract |
| Year/Revision | Unknown; copyright 2017 shown in file |
| Pages | 5 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 1657
- PID, SPN: 1326, FMI: 11/31, LAMP: Amber
- Engine Misfire Cylinder 4 – Condition Exists
- Circuit Description
- Component Location
- Reason
- Effect
- 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
- Troubleshooting Steps
- Step 1A) Read the fault codes
- Step 1B) Check for cylinder misfire
- Step 2A) Perform the cylinder cutout test
- Step 3A) Check if an ECM calibration update is available
- Step 3B) Disable the fault code
Applicable truck models
This document covers Cummins ISB6.7 CM2350 engines in the 2013-17 DTC group, where Fault Code 1657 indicates that the ECM detected a cylinder number 4 misfire. The extract does not list truck chassis, vocational models, or OEM applications, so use engine model and ECM family to confirm fitment before applying the procedure. For current manufacturer information, visit Cummins official website.
Who needs this Cummins 1657 fault manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins 1657 fault manual when an ISB6.7 CM2350 logs an amber CHECK ENGINE lamp, SPN 1326 FMI 11/31, or a complaint such as low power, rough idle, smoke, stumble, or misfire. The procedure helps separate fuel system fault codes, injector cutout results, mechanical cylinder problems, valve lash issues, and possible ECM calibration updates.
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