All 1980-1995 and including 1995 EFI equipped vehicle allow you to find engine and related faults by pulling the ECU (computer) codes without the need for a handheld OBDII diagnosis scanner,the sites listed below have the fault codes needed to pull the codes and the instructions on how to do it:
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
Any public library in your area would have the Factory service manual,Haynes,Chiltons,Mitchells and Toyota repair books. There is also free AutoZone service manuals at:
formatting link
Finally there is a free aftermarket 1995 4-Runner (22R-E and 3VZE) service manual at:
formatting link
For scanned pages of factory service manuals for other engines:
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link
formatting link