Symptoms of a Bad or Failing ECM-Power Relay. The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems.
1 Replace the tire if the top of Abe's head becomes uncovered by any of the grooves.  If your tires are only partially worn, find out how much. Stick a tread-depth gauge (about $5 at auto-parts stores) into each of the grooves on all four tires, as shown in the photo below. Then check how many inches of usable tread remain and match your driving to the tread wear.
In the UK, 1.6mm across 75% of the width of the tread. There is no national law in the U.S. on tread depth. However 42 states consider 2/32 the minimum. California & Idaho coâ¦nsider 1/32 the minimum. Arkansas, Montana, New Mexico, North Dakota, South Carolina, and West Virginia have no minimum. A tire below 3/32 cannot pass the Texas safety inspection. In Canada the minimum is 2/32. Some experts including Consumer Reports consider 4/32 the minimum. My opinion is that when the tire has less than 3/32 it should be replaced.