Cummins fault code 779 is the Cummins ISX11.9 CM2250 diagnostic trouble code for Auxiliary Equipment Sensor Input 3 – Root Cause Not Known. This 4-page troubleshooting PDF is taken from the Cummins ISX11.9 CM2250 (2010-12) service documentation and explains the circuit, the conditions that set the fault, and the guided steps used to confirm the repair. It is logged as SPN 703, FMI 11/11 with amber warning lamp, and the failure typically points to an OEM auxiliary equipment sensor input that exceeded the engine protection limit.
Cummins fault code 779 document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISB6.7, ISC8.3 and ISL9 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code identifiers | PID S51 · SPN 703 · FMI 11/11 · Lamp Amber |
| Associated procedures | Cummins Procedures the OEM-defined engine protection routine |
| Revision | Last modified 20-Jul-2010 |
| Pages | 4 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Fault code reason, effect and identifiers
- Conditions for running and setting the diagnostic
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and guided troubleshooting steps
Applicable truck models
This diagnostic trouble code applies to Cummins ISB6.7, ISC8.3 and ISL9 CM2250 engines built in the 2010-12 CM2250 range and covers the auxiliary equipment sensor input circuit. Component locations vary by original equipment manufacturer, so the wiring and connector views in the manual should be read alongside the vehicle build. For calibration histories, INSITE service-tool resources and the latest revision of this Cummins troubleshooting procedure, see the Cummins engine support website.
Who needs this Cummins fault code 779 manual
Heavy-duty truck technicians and workshop owners diagnosing an OEM auxiliary equipment sensor input that exceeded the engine protection limit on ISX11.9 CM2250 engines rely on this reference. It ties the INSITE reading to the correct Cummins repair procedures so the fault can be confirmed and cleared without guesswork. Reviewing the guided steps before connecting a scan tool shortens diagnosis time and helps technicians avoid replacing parts that are still good.
The full PDF is available in the DiagTechPro manuals library, where a free account is required to download it.
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