Thx to help from this site I was able to find out how to use the jumper wire to get the codes from my 1990 Toyota Pickup. The problem I'm having now is translating them. After we turned the truck on (not cranking it), It gave the following flashes:
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II...I...IIII...II...IIIII..............II...I...I III...II...IIIII...........

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It kept cycling through the same series until I turned the truck off. My question is whether I have codes 21, 42, 5 or 21, 4, 25. I feel confident that I can fix the problem once I can determine what the actual codes are I can get the problem fixed. Any help would be greatly appreciated.
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