Dowload the ignition portion of the FSM
here and troubleshoot as on page IG-18.
Download the fuel injection portion of the manual
here. The IGT signal test in the Ignition troubleshooting portion makes reference to specifications in the EFI manual.
FSM for the 1995 4Runner can be downloaded in .rar format
here.
I think the bottom line is - if everything is good, it's the ignitor.