Testing Computers — WSU

Testing Computers — WSU - Testing Computers...

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Testing Computers On-board computers in automobiles cannot be directly tested; instead a process of elimination is used to determine if the computer is good. Testing the following items will assist you in deciding if the computer needs to be replaced: Test all power feeds to the computer, most computers have at least two power feeds. One power feed 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 voltage level is the same on each power feed (close to battery voltage). If it is not, check the wiring to the computer for poor connections, shorts, and open circuits. Check for adequate current delivery to each power feed with a low resistance test light. The test light should be bright an all power feeds. If the light is dim on any circuit, check the wiring to the computer for poor connections, shorts, and open circuits.
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