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Auxiliary Equipment Sensor Input 3 – 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 – Root Cause Not Known |
Possible engine derate. |
 OEM Temperature/Pressure Sensor Circuit
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Circuit Description
The original equipment manufacturer (OEM) has the option of wiring a pressure or temperature sensor input to the Cummins® electronic control module (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 can 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 and repair manual for sensor location.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
The ECM detects that the engine protection limit for the OEM input device has been exceeded.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- Engine power can be limited, depending on the specific OEM calibration.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
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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