Where do you scan the ecm on a 1991 olds 98 3800?

To scan the ECM (Engine Control Module) on a 1991 Oldsmobile 98 with a 3800 engine, locate the diagnostic port, which is typically found under the dashboard near the steering column. You may need an OBD-I scanner or a paperclip to connect terminals for retrieving diagnostic codes. Follow the specific procedure for your scanner to access the trouble codes stored in the ECM. Always refer to the vehicle’s service manual for detailed instructions specific to your model.