This Cummins cylinder misfire code document is a 7-page troubleshooting PDF for Fault Code 1658, Engine Misfire Cylinder 5 – Condition Exists. It explains how the ECM detects high or low cylinder 5 contribution at idle, what symptoms may appear, and how INSITE™ electronic service tool is used during checks.
Official Cummins cylinder misfire code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250; file group lists ISB6.7 CM2250 (2010-12) |
| System/Group | DTCs; ECM circuit and cylinder misfire diagnostics |
| Publication no. | Not shown in the extract; associated bulletin numbers include 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Unknown; 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 1658 – Engine Misfire Cylinder 5 – 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
This procedure applies to Cummins CM2250 engine families named in the extract: ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250, with the library file group also listing ISB6.7 CM2250 (2010-12). The document is written around ECM detection of cylinder number 5 misfire, amber CHECK ENGINE lamp or MIL operation, and validation by idling the engine after repair. For official engine and service information, visit Cummins official website.
Who needs this Cummins cylinder misfire code manual
Workshop technicians need this Cummins cylinder misfire code manual when diagnosing rough idle, low power, black or white smoke, engine stumble, or an active Fault Code 1658. It is also useful for fleet maintenance teams checking whether the issue is injector related, calibration related, or caused by valve lash, cylinder, valve, gasket, camshaft, sealing washer, or air compressor timing faults.
The guided process starts by reading fuel system fault codes with INSITE™ electronic service tool, then checking for misfire at low idle, high idle, and snap throttle acceleration. If the cylinder cutout test isolates the malfunction to cylinder number 5 injector, the document directs replacement under Procedure 006-026; if not, it points technicians toward other mechanical sources of misfire. It also includes an ECM calibration review using Procedure 019-032 and final fault clearing steps.
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