this is OBD1. if you can't pull a code (don't get that), have the light blink at you.
to many things could be the issue. egr, iac, map/maf, so on.....
need codes!
if you need a manual, you can go here,
http://www.autozone.com/autozone/
it's a FREE online only manual for your truck. just sign up, plug in vehicle info, and go to,
REPAIR INFO / 1994 TOYOTA TRUCK PICKUP 2WD 3.0L EFI 6CYL REPAIR GUIDE / DRIVEABILITY & EMISSION CONTROLS / TROUBLE CODES / READING CODES
it tells you what the blinks mean if a reader doesn't work on the obd port.
owner 93 toy pu