What and where is the TDC sensor on a 1990 civic hatchback 1.5?

The TDC (Top Dead Center) sensor on a 1990 Honda Civic Hatchback 1.5 is typically located on the engine block, near the crankshaft pulley. It is responsible for detecting the position of the crankshaft to ensure proper timing for ignition and fuel injection. You may need to remove certain components to access it easily, as it can be somewhat obscured by other engine parts. It's important to consult the vehicle's service manual for precise location and instructions.