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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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