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Auxiliary Equipment Sensor Input #3 (OEM Switch) – Root Cause Not Known
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 779 PID: S051 SPN: 703 FMI: 11 LAMP: Amber SRT: |
Auxiliary Equipment Sensor Input #3 (OEM Switch) – Root Cause Not Known. |
Possible engine power derate. |
 OEM Temperature/Pressure Sensor Circuit
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Circuit Description
The OEM has the option of wiring a pressure or temperature sensor input to the Cummins ECM. A specific calibration is then created to recognize this pressure or temperature sensor input. This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. Depending on OEM requirements, an Engine Protection derate may be associated with this fault code.
Component Location
The OEM pressure or temperature sensor input will vary depending on application. Refer to the OEM troubleshooting manual for sensor location.
Shop Talk
This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. An engine power derate is possible depending on the OEM application.
Refer to Troubleshooting Fault Code t05-779
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