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Engine Fuel Shutoff Valve Driver – Mechanical System Not Responding Properly or Out of Adjustment
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 257 (ISM) PID: S017 SPN: 632 FMI: 7/7 LAMP: Amber SRT: |
Engine Fuel Shutoff Valve Driver – Mechanical System Not Responding Properly or Out of Adjustment. Fuel shutoff valve is stuck open mechanically or leaking. |
Engine will run derated. The engine may run on for a brief period when the keyswitch is turned OFF. |
 Engine Fuel Shutoff Valve
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Circuit Description
Voltage is supplied to the fuel shutoff valve by the electronic control module (ECM) while the engine keyswitch is ON. While the keyswitch is turned OFF, the voltage to the fuel shutoff valve is turned off by the ECM. The fuel shutoff valve closes and stops fuel from flowing to the fuel system.
Component Location
The fuel shutoff valve is located on the fuel system. Refer to Procedure 100-002 in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs immediately after the keyswitch is turned to the OFF position.
Conditions for Setting the Fault Codes
Engine speed is greater than a calibratable after the keyswitch is turned off.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleared using the INSITE™ electronic service tool.
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, calibrate the ECM. Refer to Procedure 019-032 in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
Upon turning the keyswitch OFF, the ECM turns off the voltage supplied to keep the fuel shutoff valve open. The fuel control continues to fire the injectors for a short period of time as the engine speeds down. The ECM monitors engine speed using the engine position sensor during this time. If the engine speed does not drop after the keyswitch is turned OFF, the ECM activates this fault. A possible cause of this fault code is extra wires attached to the fuel shutoff valve.
Refer to Troubleshooting Fault Code t05-257
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