How do you pull codes on 93 Mitsubishi fuso?

To pull diagnostic trouble codes (DTCs) from a 1993 Mitsubishi Fuso, locate the diagnostic connector, usually found under the dashboard. Use a jumper wire to connect terminals 1 and 4 on the connector. Turn the ignition key to the "ON" position without starting the engine, and observe the check engine light, which will flash the codes in a series of long and short flashes. Count the flashes to determine the codes, referring to the vehicle's service manual for specific code meanings.