Being the truck is a 89, it should run OBD 1 codes. I know smaller cars/trucks are different from larger, but with OBD 1 there was a way to retrieve codes WITHOUT a code reader/scanner, but I can't remember how now. You would go through a process and count blinks of the "service engine light" if I recall correctly.. OBD 2 which requires the scan tool came in in like 94 or 95 if I'm not mistaken.
Maybe someone else here can tell you how to do it without the reader?? (I'm just a pinch too young to remember how my dad used to do it on our family's early 90's Chevy cars/trucks, and all of my vehicles have either been long before OBD1 or have been new enough to have OBD2)
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Today's Featured Article - Tractor Profile: Ferguson TO-20 - by Staff. When the infamous "Handshake Agreement" between Henry Ford and Harry Ferguson fell by the wayside (that's a story in itself), Harry Ferguson quickly set up manufacturing plants for a United States version of his English TE-20. The TO-20 was relatively the same as the TE-20 except utilized some different casting materials and had a US-style electrical system. The TO-20 was a dead ringer for the Ford 9N and 2N models and they say that Ferguson did this on purpose when the Handshake Agreement wen
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