The go-to tool when there is no communication with the scan tool. Modern

vehicles have roughly 15 to 25 computers all talking to one another on

shared circuits. When those circuits fail, the vehicle may exhibit any

number of problems.The EEFF500 is a specialty tool that isolates

the problem portion of the affected circuit quickly and easily. It

features 12 switchable circuits and LED self-testing. Open circuits show

up amber and short circuits show up red for easy detection.