This Cummins fault code 1878 document is a troubleshooting PDF for aftertreatment exhaust gas temperature 3 data that is erratic, intermittent, or incorrect. It explains how the ECM monitors the diesel particulate filter outlet temperature sensor and what tests are used when active regeneration is disabled.
Official Cummins fault code 1878 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; aftertreatment temperature sensors |
| Publication no. | Not shown in the extract |
| Year/Revision | Year unknown; last modified 20-Jul-2010 and 15-Sep-2010 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1878 – Aftertreatment Exhaust Gas Temperature 3 – Data Erratic, Intermittent, or Incorrect
- 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 for sensor circuit 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 ISB6.7 CM2150 engines from the 2007-09 coverage group, with the text also naming ISB, ISC, and ISL with CM2150 aftertreatment temperature sensors. The procedure centers on the aftertreatment diesel particulate filter outlet temperature sensor, the ECM, the OEM harness, and INSITE electronic service tool checks. See the manufacturer at Cummins official website.
Who needs this fault code 1878 manual
Workshop technicians need this manual when the amber CHECK ENGINE light is active and the ECM reports SPN 3245 FMI 2/2 for aftertreatment exhaust gas temperature 3. It is useful for checking sensor connector condition, circuit response, pin-to-pin shorts, pin-to-ground shorts, repair verification, and clearing active or inactive fault codes.
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