Tip & How-To about GMC Blazer
On gm vehicles that are 1993 and older with an ecm,it is possible to diagnose check engine light using a paper clip.just below driver is a black box that has either 6 or 12 slots.put paper cilp one end in slots a and 1in slot b then watch check engine light.count flashes ,should flash once then pause then it will flash 2 times indicating a code 12 it will flash thic code thee times indicating computer is working after the code 12 it will flash the trouble codes.
Posted by ricks auto... on
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