Testing ComputersOn-board computers in automobiles cannot be directly tested; instead a process of elimination is used todetermine if the computer is good.Testing the following items will assist you in deciding if the computer needs to be replaced:Test all power feedsto the computer, most computers have at least two power feeds. One powerfeed is constant battery power, the other is switched ignition power.Check the voltage level on each power feed with a digital multimeter; make sure the voltagelevel is the same on each power feed (close to battery voltage). If it is not, check the wiring tothe computer for poor connections, shorts, and open circuits.Check for adequate current delivery to each power feed with a low resistance test light. Thetest light should be bright an all power feeds. If the light is dim on any circuit, check thewiring to the computer for poor connections, shorts, and open circuits.
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Input device, Input/output, Output devices, poor connections, open circuits