This 7-page PDF is the official Cummins 1659 fault code troubleshooting document for engine misfire detected in cylinder number 6 on CM2250-controlled engines. It provides circuit descriptions, diagnostic conditions, step-by-step guided troubleshooting procedures, and injector replacement references. The document covers ISX15, ISX11.9, QSL9, and QSB6.7 engine platforms equipped with CM2250 electronic control modules.
Official Cummins 1659 fault code document details
| Brand | Cummins |
| Model coverage | ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs — Engine Misfire Cylinder 6 |
| Publication no. | Code 1659 (SPN 1328, FMI 11/31) |
| Year/Revision | Last modified 20-Jul-2010 |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description, Component Location
- Fault Code 1659 — Engine Misfire Cylinder 6 – Condition Exists (SPN 1328, FMI 11/31)
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk — Common Causes of Cylinder Misfire
- Associated Procedures Table (Procedure 006-026 Injector, Procedure 019-032 ECM Calibration Code)
- Guided Step 1 — Check the Fault Codes (1A: Read Fault Codes, 1B: Check for Cylinder Misfire)
- Guided Step 2 — Perform Diagnostic Tests (2A: Cylinder Cutout Test)
- Guided Step 3 — Check ECM Calibration and Clear Fault Codes (3A: ECM Calibration Update, 3B: Disable the Fault Code)
Applicable truck models
This document applies to vehicles and equipment powered by Cummins ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engines. The diagnostic runs continuously when engine coolant temperature exceeds 71°C (160°F). The ECM illuminates the amber CHECK ENGINE lamp or MIL when the fault is active. Causes identified in the document include valve lash out of specification, cylinder or valve malfunction, cylinder head or gasket damage, extreme camshaft wear, injector sealing washer issues, injector malfunction, and mistimed air compressor. The guided procedure uses INSITE™ electronic service tool for fault code reading, cylinder cutout testing, and ECM calibration verification. For additional engine service information, visit the Cummins official website.
Who needs this Cummins 1659 fault code manual
Diesel mechanics and workshop owners diagnosing low power, rough idle, or misfire complaints on CM2250-equipped trucks need this guide. It provides the exact decision tree — from reading fuel system fault codes through injector swap testing to ECM calibration checks — required to resolve Fault Code 1659 efficiently.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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