I have lost all power to the EFI system on my 1987 Toyota pickup,I am thinking its the main relay but I cant find it.I have the Chilton manual for it and it shows the main relay in the wiring diagram but I cant find a location for it.If anyone knows where it would be located,or has any idea what else might cause this problem your help would be greatly appreciated. Also,I have checked all the fuses already so I know that's not the problem.