No power to injectors


Asked by Aug 13, 2015 at 04:52 PM about the 1992 Isuzu Trooper 4 Dr LS 4WD SUV

Question type: Maintenance & Repair

I have a 92 trooper that was running fine. One day it would not start. I checked all
fuses and wires and found no voltage to injectors. While trying to trace down the no
voltage issue it started and ran fine for a day. Now it is back to no voltage to the
It has spark/power to ignition control module.
Power to fuel pump.
No power to fuel injectors.
Does anyone know how or what pins to test on ECU for the fuel injectors?

4 Answers


The ECM only provides the trigger signal to the injectors and that signal is a ground, I have ran across some of these rig loosing connection at the voltage dropping resistor for the injectors, might be worth a look and make sure it is connected properly and the case is grounded properly.

2 out of 2 people think this is helpful.

Do AGREE with #tennisshoe, ground on injectors kept me busy for days.


Great thought, but I don't think it is the case here. I tested (with ohm meter) the wires from injectors to exterior resistors, resistors to ECU and then ECU all the way back to the injectors. All measure good. Any other thoughts?


I think this would be a situation where the wiggle test would be the best thing to try and watch for power dropping in and out as you go down the harness.

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