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Hello. Welcome to Just Answer. Please allow me to assist you. Normally, when we see a 'no communication" issue, we suspect a bad electronic control unit. This is, of course, assuming that the scanner is compatible with this vehicle. Not all scanners work on Toyotas.
Then I would be looking for an interruption of power to the ECU. Most likely a blown fuse.
This vehicle has 2 fuse panels. One under the hood, the other under the dash on the driver side
What year is this rav/4
You need to see if you have battery voltage at the socket for the 5 amp EFI 2 fuse. Fuse panel under the hood.
ok. I need to get my papers on this. I will get back to you shortly.
If EFI 3 fuse is blowing, this fuse powers the Oxygen sensors. Unplug them and see if a new fuse does not blow. The oxygen sensors are the ones after the catalytic converter.
Sorry internet went down...Does the EFI fuse blow now?