How do you check engine codes in a 1995 Toyota T100?

To check engine codes in a 1995 Toyota T100, locate the diagnostic connector under the dashboard near the steering column. Use a jumper wire to connect terminals TE1 and E1 in the connector. Turn the ignition key to the "On" position (but do not start the engine), and watch for the engine check light to flash. The flashes correspond to the trouble codes, which you can decode using the vehicle's service manual.