To find the source of a shutdown problem, you'll need to diagnose the specific issue. Possible causes and related components include:
* Ignition System: Problems with the ignition switch, ignition coil, distributor (if equipped), crankshaft position sensor, or camshaft position sensor can cause the engine to shut down. These components are generally located under the hood.
* Fuel System: A faulty fuel pump, fuel filter, or injectors can lead to engine shutdown. The fuel pump is often located in the fuel tank, while the filter and injectors are under the hood.
* Computer/ECU: The Powertrain Control Module (PCM or ECU) is the "brain" of the engine. A malfunctioning PCM can cause a variety of problems, including unexpected shutdowns. The location of the PCM varies by model and engine type; it is usually under the dashboard or under the hood.
* Sensors: Numerous sensors monitor engine conditions. A faulty sensor (like a temperature sensor, oxygen sensor, etc.) can trigger the engine to shut down as a safety measure. These are scattered throughout the engine bay.
* Wiring and Connectors: Corrosion, loose connections, or damaged wiring can interrupt the electrical signals needed for the engine to run. Inspect all wiring harnesses and connectors.
Instead of looking for a specific "automatic shutdown relay," you need to diagnose the problem. Start by describing the symptoms (e.g., does it shut down immediately, after a period of running, under certain conditions?). A mechanic with a diagnostic scanner can be invaluable in determining the root cause. Trying to troubleshoot without specific symptoms will likely lead to fruitless searching.
