Your Fiero uses the OBDI system. Do you have a OBDI scan tool? A OBDII scanner will not work on your car. It is possible to jump across the A and B terminals on the ALDL connector under the dash, using a metal paper clip as a jumper. The trouble codes would appear on the dash as a blinking check engine light. If you wish, I can get the website that has excellent instructions on readidng the flashes to determine the codes.
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