does any one know how to reset the ecu on a 91 turbo fc3s

 

Disconnect the battery ground.
Step on the brake so the brake lights can discharge any capacitors.
Wait a few more seconds & reconnect the battery.

 

ok thanks i will try that

 

Just adding a few words for the sake of future searching because one day I'd like to own an S5...I love this place.

Keywords: Resetting clearing codes code trouble malfunction service engine soon S5 89 90 91 RX-7 89-91 TII

1. Disconnect Battery Ground
2. Step on the brake to discharge Capacitors (which store electricity) to clear ECU
trouble codes