This Cummins 1876 troubleshooting document is a fault-code manual for Cummins ISB, ISC, and ISL engines with CM2150 aftertreatment temperature sensors. It explains Fault Code 1876, SPN 3245 FMI 3/3, for an aftertreatment exhaust gas temperature 3 circuit voltage above normal or shorted to a high source.
Official Cummins 1876 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; ISB6.7 CM2150 (2007-09) group reference |
| System/Group | Aftertreatment Temperature Sensors / DTCs |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 14 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- 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
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the aftertreatment diesel particulate filter outlet temperature sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines with CM2150 controls using the aftertreatment temperature sensor circuit described in the extract. The component discussed is the aftertreatment diesel particulate filter outlet temperature sensor in the aftertreatment system; the document directs users to the OEM troubleshooting and repair manual for exact component location and wiring identification. Manufacturer information is available at Cummins official website.
Who needs this Cummins 1876 troubleshooting manual
Workshop owners, diesel mechanics, and diagnostic technicians need this file when an amber CHECK ENGINE lamp is present and Fault Code 1876 is active or inactive. The procedure supports INSITE™ checks, sensor connector inspection, OEM harness resistance tests, pin-to-pin short checks, and final clearing of inactive fault codes.
The diagnostic details state that the ECM monitors a 5 VDC reference circuit and sets the code when the aftertreatment diesel particulate filter outlet temperature signal voltage is greater than 4.97-VDC for more than 2 seconds. When active, the ECM uses a default outlet temperature value and disables active aftertreatment diesel particulate filter regeneration. The guided steps cover checking for Fault Code 1877 during circuit response testing, measuring for less than 10 ohms on return and signal circuits, confirming greater than 100k ohms for short-circuit checks, repairing or replacing the OEM harness where required, and replacing the aftertreatment exhaust gas temperature sensor when the sensor fault is confirmed.
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