EFI fuse blown.

2002 tundra V6. Replaced blown EFI fuse and relay, start right up few days later fuse blows again. Use a short tracer probe that take me to a wire harness located under the driver side dash near the interior fuse box. Problem is unable to find shorted wire among multiple wires harness. Might help to know what color code wire is coming from the blown EFI fuse. Any thoughts on this issue.

 

Absolutely. Start here: https://www.tundras.com/threads/so-you-wanna-buy-just-bought-a-1st-gen-tundra-eh.115928/

Notice around the 4th, maybe 5th line, there's a series of links? Click on the one for "Tundras", i.e. 'wiring diagrams (Tundra, Sequoia)'

Everything you need to know is there, as long as you haven't swapped your engine at any point. There are minor differences on a few things year to year with engine wiring. But if you haven't engine-swapped, it's nothing to worry about.

 

Given it's 5VZ, assume you're speaking of EFI NO 1 fuse ?
It's a black/red wire that feeds 12vdc to the EFI relay contacts and also feeds 12vdc to the ECM, BATT input.

I suggest you pull that EFI NO 1 fuse (1) and the EFI relay (2). With a volt/ohm meter, you need to see if the side that's going to the direction of the relay and also the ECM is shorted to gnd. If it is, I suggest you unplug the 26 pin IA4 connecter (3) that sends the black/red wire to the ECM. Unlikely but if it's still shorted, the problem is IA4 to ECM section of conductor.

Keeping in mind it also could be shorted from EFI relay contact pin 3 to IA4 on to the ECM +B input to ECM.