This Cummins 1655 misfire manual is a 7-page troubleshooting document for Fault Code 1655, Engine Misfire Cylinder 2 – Condition Exists. It explains how the ECM monitors cylinder contribution at idle, when the amber CHECK ENGINE lamp or MIL is triggered, and how INSITE™ is used to confirm and clear the fault.
Official Cummins 1655 misfire manual document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | DTCs; ECM circuit; injector and ECM calibration troubleshooting |
| Publication no. | Not specified in the extract |
| Year/Revision | Last Modified: 11-Jun-2010 and 20-Jul-2010 |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- FAULT CODE 1655 – Engine Misfire Cylinder 2 – Condition Exists
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Perform diagnostic tests.
- Guided Step 3 – Check if an ECM calibration update is available.
Applicable truck models
The extract identifies this procedure for Cummins CM2250 engine platforms listed in the associated procedures table: ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. It is centered on Fault Code 1655, SPN 1324, FMI 11/31, where cylinder number 2 has high or low contribution to engine speed and the ECM detects a misfire condition. See the manufacturer at Cummins official website.
Who needs this Cummins 1655 misfire manual
Workshop owners, diesel technicians, and fleet mechanics need this 1655 misfire manual when a CM2250 engine shows low power, rough idle, smoke, stumble, or a cylinder 2 misfire complaint. The procedure supports fault-code checks, cylinder cutout testing, injector isolation, ECM calibration review, and final fault clearing with INSITE™.
The document also lists possible mechanical and fuel-system causes that must not be missed: valve lash out of specification, high blowby, valve malfunction, cylinder head or gasket damage, extreme camshaft wear, injector sealing washer problems, injector malfunction, and air compressor timing after replacement. Full PDF available in the DiagTechPro manuals library, free account required to download.
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