Dear Toyota friends!
I'm writing to you from remote Hungary as a happy 4Runner owner. The car is a 1988, 22RE engine 4Runner. I had a full engine upgrading done and after assembly I encountered the following problem: Both poles on the injector line have current, even if the current wiring is disconnected from the ECU. This is also the case when I transfer only one wire from the solenoid resistor to the injectors (blue or yellow).
The wiring to the ECU has current in both the no.10 and the no.20.
If I disconnect the solenoid resistor connector, naturally there is no current going to the injectors.
The engine is turning but it does not start. The ground leads are in place. I checked the wiring completely and I did not find any errors.Please help us solve the problem! Thank you in advance for your help!

 

You should have voltage at the ECU side of the injector wiring, perfectly normal. If you look at the wiring schematic you should see the power flows from the resistor to the injector, then to the ECU (note the splice points that tie the injector into a batch mode activation), the ECU will switch these leads to ground to open the injectors (all at the same time).

Check for spark(spark tester, or noid light), check for fuel (voltage test on thr FP wire in the diagnostics connection, and fuel in the return line), verify valve timing, and finally base timing (distributor placement).

 

Like Co says above and especially the splices. Removing and replacing the engine could easily break those crimps under the intake manifold. Because they connect the wires in parallel, you would still get a voltage reading at #10 or #20 even if wires to negative side of 3 out of 4 injectors are broken. Check all the connections on that part of the harness.
Search and you'll see 2 recent threads about this; one such is Yotarick's.