VERY confused about obd1 testing for 1994 Pontiac Trans Sport 3800?

  • Thread starter Thread starter GlitterSno75
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GlitterSno75

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Are there 2 types of OBD1? I know it is not an OBD2. We went to test the computer to see the trouble codes and it is completely different than what is in the manual for this type of van. There are only 3 wires going to the terminal to test it. Sooooo, any ideas? I hope I am making some sense...
 
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