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
injectors.
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

83,105

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.
2,995

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?

83,105

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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