Mazda MPV Where to read eng. code?

On my V6 MPV (1991) engine light came up a few times.
I'd like to find out which code it was.
Can someone advise where in engine compartment is
the connector to interface a code reader.
My neighbour has the reader, but he did not know which
connector to use.

Thanks

I'm not sure, but I thimk the OBDII plug is under the dash.