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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I have obd1 fuel injection in my '86 Jeep CJ and use an Actron reader that I bought from Actron years ago. Otherwise, I can use a paper clip to connect two of the terminals in the plug that is used for the emissions inspection. With the key in the on position, I can determine if there are any codes being sent by reading blinking check engine light flashes. You should be able to find out how to read codes from a repair manual for your truck.