SUPPORT 7Y0734 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the following diagnostic codes:
17-5 Fuel Shutoff Valve current below normal
17-6 Fuel Shutoff Valve current above normal
17-12 Fuel Shutoff Valve failureThe Electronic Control Module (ECM) contains the logic and the outputs for control of starting the engine and stopping the engine. The logic for starting and for stopping is customer programmable. The logic responds to inputs from the following components:
ECM
Emergency stop switch
Remote start switch
Data link
Other inputsTo enable fuel flow to the engine, the Gas Shutoff Valve (GSOV) must be energized. The GSOV may be controlled by the ECM or by the customer's equipment. Use this procedure when the ECM controls the GSOV. Refer to the appropriate documentation when the GSOV is controlled by the customer's equipment.The most likely causes of a diagnostic code are a poor electrical connection or a problem in a wiring harness. The next likely cause is a problem with the GSOV. The least likely cause is a problem with the ECM.A 17-12 diagnostic code is activated after the following sequence of events:The engine is running.An engine stop signal has been received.Electrical power has been removed from the GSOV.The engine speed remains above 100 rpm.When these events occur, the ECM assumes that the GSOV did not close. The ECM terminates the ignition. The ECM also issues a 17-12 diagnostic code. Unburned gas remains in the air inlet and exhaust system.The following information describes the system's operation when the GSOV is controlled by the ECM:The ECM output for the fuel shutoff valve is called the