How do you pull codes on 1991 Toyota Previa?

To pull diagnostic trouble codes (DTCs) from a 1991 Toyota Previa, locate the diagnostic connector under the dashboard, usually near the driver's side. Use a jumper wire to connect terminals TE1 and E1 on the connector. Then, turn the ignition key to the "ON" position (without starting the engine) and watch the check engine light; it will blink in a specific pattern to indicate the trouble codes. Count the blinks to interpret the codes, which can be referenced in a repair manual or online for further diagnosis.