This Cummins fault 1866 document is a troubleshooting guide for EGR differential pressure sensor delta pressure data that is erratic, intermittent, or incorrect. It explains the circuit, fault conditions, ECM actions, related fault checks, guided diagnostic steps, calibration review, and fault clearing using INSITE™ electronic service tool.
Official Cummins fault 1866 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; EGR differential pressure sensor circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures; other bulletin numbers listed include 4022257, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 19-Jan-2011 |
| Pages | 14 |
| 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
- 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 EGR differential pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine platforms identified in the document, with ISB6.7 CM2250 listed as the primary coverage for file info and associated Procedure 019-031, Procedure 019-032, Procedure 019-043, and Procedure 019-370. The procedure also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 where the same EGR differential pressure sensor circuit and related ECM diagnostics are used. For manufacturer information, visit Cummins official website.
Who needs this Cummins fault 1866 manual
Mechanics, fleet technicians, and workshop owners need this Cummins fault 1866 manual when an amber CHECK ENGINE lamp or MIL is tied to SPN 411 FMI 2 and the EGR valve actuation is disabled. It supports checks for Fault Code 2273 or 2274, connector pin damage, high resistance, short circuits, sensor replacement, engine harness repair, ECM authorization, and ECM calibration updates.
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