This Cummins ISB6.7 2646 document explains Fault Code 2646 for engine coolant temperature on ISB, ISC, and ISL engines. It identifies the code as an information fault related to EGR valve closure when coolant temperature nears engine protection limits. The file is a short Cummins diagnostic reference for checking active codes with INSITE™.
Official Cummins ISB6.7 2646 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, ISL; ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Engine Coolant Temperature Circuit |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 3 |
| 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 2646
- 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 1A – Check for active fault codes.
Applicable truck models
This document applies to Cummins ISB, ISC, and ISL engine applications, with the library listing placing it under ISB6.7 CM2150 (2007-09) DTCs. The extract identifies the system as the Engine Coolant Temperature Circuit and references the engine coolant temperature sensor on the thermostat housing. It does not name specific truck makes or chassis models, so coverage should be matched by engine family, ECM calibration, and active diagnostic code. For official engine support and service information, visit Cummins official website.
Who needs this Cummins ISB6.7 2646 manual
Workshop owners, diesel mechanics, and fleet technicians need this ISB fault code manual when Fault Code 2646 is logged and the amber CHECK ENGINE light is active. It helps confirm that the ECM closed the EGR valve to reduce engine coolant temperature and that no repair is necessary when Fault Code 2646 is not active.
The troubleshooting section directs the technician to turn the keyswitch ON, connect the INSITE™ electronic service tool, and read active fault codes. If Fault Code 2646 is active, the stated reason is that the EGR valve was closed to reduce engine coolant temperature. If it is not active, the document states that no repair is necessary and the repair is complete. The Shop Talk note also advises verifying the electronic control module calibration and checking QuickServe® Online calibration revision history for applicable fixes before recalibrating the ECM if needed.
Full PDF available in the DiagTechPro manuals library, free account required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
