This fault code 779 DTCs document is a diagnostic PDF for Auxiliary Equipment Sensor Input 3 on CM2250 engines. It explains how the ECM reacts when an OEM pressure or temperature sensor input exceeds the engine protection limit, including amber CHECK ENGINE lamp behavior and possible engine derate. The file also lists the INSITE™ fault-code check and the direction to use the OEM service manual when the condition is confirmed.
Official fault code 779 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also associated with ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in the procedure table |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Auxiliary Equipment Sensor Input 3 Circuit |
| Publication no. | Bulletin numbers shown: 4022254, 4022257, 2883445, 4022256, 4022255 |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 20-Jul-2010 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 779 – Auxiliary Equipment Sensor Input 3 – Root Cause Not Known
- 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 1A – Check for Fault Code 779.
Applicable truck models
This document applies to Cummins engines and OEM applications using an OEM pressure or temperature sensor input connected to the Cummins® electronic control module. The extracted coverage names ISB6.7 CM2250 directly, and the associated procedure table also references ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 ECM Calibration Code Procedure 019-032 entries. Sensor location is not fixed in the PDF because the OEM pressure or temperature sensor input varies by application, so the manual directs technicians to the OEM service manual. See the manufacturer at Cummins official website.
Who needs this fault code 779 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this code 779 DTCs manual when INSITE™ electronic service tool shows active or inactive counts for Fault Code 779, PID S51, SPN 703, FMI 11/11. The procedure helps confirm that the engine protection limit for the OEM supplied pressure or temperature input has been exceeded and that the next diagnostic reference is the OEM service manual.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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