Toyota 7FGCSU20-72857

I have a check engine light on (outline of an engine) and am wondering how to check or pull codes to further diagnose the light. The forklift runs great by the way. There is a small diagnosis port behind the battery that has 23 ports on it, but only the FP, E1, +B, VF2, WA and WB ports have terminals in them. Is there a way to short two of the terminals and get a blink code from the engine light?

I have already changed the O2 sensor and am planning on doing a tune-up (plugs, wires and cap). Any info you could share would go a long way, considering I have only a parts list for this forklift.

Thanks in advance.