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Carburetor to EFI conversion
Part 4: Wiring Harness Assembly

I started by laying out the harness how it came out of the truck, taking ALL of the sheathing off of the entire wiring harness, and started tracing out wires. I cut out 1/2 of the harness even before I started connecting things to the computer. Things such as headlights, heater controls, etc. I knew would not be needed for my harness. The good thing is that two of the plugs that go into the computer can be disconnected and are only go to the engine. So, if you unplug these from the intake, then pull the intake intact, it will save you lots of grief . The third plug has the power and other things going to it for the EFI.

All I can say is to take your time and check each wire coming out of the computer.

There seems to be only 3 components outside of the "normal" EFI stuff that I found. Try to get all of these from the donor truck. 

  • The main EFI relay located in the interor fuse panel under the drivers side dash. I pulled the wires from the donor fuse panel and installed them into my truck's fuse panel. It looks factory. 
  • The circuit opening relay located under the passenger side dash. This is controlled by the MAF sensor and turns on and off the fuel pump. It is also tied into the main EFI relay.
  • The soleniod resistor is connected to a switched power source (IGN) and goes to the fuel injectors. This is located in the engine compartment passneger side.
  • Pretty much, the only thing that is not straight forward is how these three components are wired. 

No this is not a spaghetti dinner!!!

Page from Toyota manual showing pin configuration for EFI computer






Last updated: 08/07/00
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