This Cummins ISB fault 1966 document is a troubleshooting manual for aftertreatment exhaust gas temperature faults on CM2150 engines. It explains why Fault Code 1966 sets, what the ECM does when it becomes active, and which checks are used to isolate sensor, intake, injector, turbocharger, and calibration causes.
Official Cummins ISB fault 1966 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL CM2150 engines; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment exhaust gas temperature sensors / DTCs |
| Publication no. | Not shown for this file; related manuals referenced include Bulletin 4021578 and Bulletin 4021569 |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 10 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 1966
- 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
- Guided Step 1B – Monitor the aftertreatment exhaust gas temperature sensors.
- Guided Step 2 – Check the intake air system.
- Guided Step 2A – Inspect the intake air system for leaks.
- Guided Step 3 – Check the fuel system.
- Guided Step 3A – Check for an injector misfire.
- Guided Step 3B – Inspect the turbocharger exhaust outlet for oil or fuel.
- Guided Step 4 – Check ECM calibration and clear fault codes.
- Guided Step 4A – Check if an ECM calibration update is available.
- Guided Step 4B – Disable the fault code.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL CM2150 engines using an aftertreatment diesel oxidation catalyst and diesel particulate filter temperature sensor system. The file information identifies the group as ISB6.7 CM2150 (2007-09) / DTCs, while the extract also references ISB CM2150 Service Manual, Bulletin 4021578, and ISC and ISL CM2150 Service Manual, Bulletin 4021569. Vehicle aftertreatment system location is directed to the OEM service manual. For manufacturer information, visit Cummins official website.
Who needs this Cummins ISB fault 1966 manual
Workshop owners, diesel mechanics, and fleet technicians need this ISB fault 1966 manual when a red STOP ENGINE lamp is linked to excessive aftertreatment temperature. It is useful for checking aftertreatment exhaust gas temperature sensors, intake air leaks, injector misfire, turbocharger outlet oil or fuel contamination, ECM calibration, and fault clearing with INSITE™ electronic service tool.
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