This Cummins ISB6.7 779 document explains Code 779 for an OEM auxiliary pressure or temperature sensor input on ISB6.7 CM2150 engines. It covers the circuit description, fault conditions, lamp behavior, possible derate, clearing logic, Shop Talk guidance, and the INSITE™ check used in the troubleshooting step.
Official Cummins ISB6.7 779 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; OEM Temperature/Pressure Sensor Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 3 |
| 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 the fault codes.
- Guided Step 1A – Check for Fault Code 779.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) engine coverage where the original equipment manufacturer has wired a pressure or temperature sensor input to the Cummins® electronic control module. The exact OEM pressure or temperature sensor location varies by application, so the document directs technicians to the OEM troubleshooting and repair manual for sensor location and for the repair path when active or inactive counts of Fault Code 779 are found. For manufacturer information, visit the Cummins official website.
Who needs this Cummins ISB6.7 779 manual
Workshop owners, diesel technicians, and fleet mechanics need this reference when an amber CHECK ENGINE light is linked to Fault Code 779, PID S051, SPN 703, FMI 11. The file is useful for confirming that the ECM detects an exceeded engine protection limit for an OEM supplied pressure or temperature input and for checking whether engine power can be limited by OEM calibration.
The procedure instructs the technician to turn the keyswitch ON, connect the INSITE™ electronic service tool, and read active or inactive fault codes. If Fault Code 779 is present, the repair direction is to refer to the OEM troubleshooting manual; if it is not present, the result is No Repair. The Shop Talk section also tells the user to verify that the ECM calibration is correct, check calibration revision history on QuickServe® Online, and recalibrate the ECM if applicable using Procedure 019-032 in the corresponding engine troubleshooting and repair manual.
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