bonnet European for “hood.” code A numerical code, generated by the vehicle control system to indicate a fault has occurred in a particular subsystem, circuit, or part. cursor The arrow that appears on menus and some other displays. Inmost displays, the cursor moves as you scroll. fix To lock a single line of the display in a fixed position on the screen to prevent it from scrolling. Data readings remain live while the parameter categories are fixed. frame One complete data package, or transmission cycle, from an electronic control module (ECM) that provides serial data of control system operating parameters. hold To capture and hold a single data frame for review or printing. movie A vehicle data record whose length depends on the number of selected data parameters. menu A list of vehicle tests or programs from which a selection can be made. parameter A measured value of control system input or output operation. Parameters include voltage signals, as well as temperature, pressure, speed, and other data.