No power to fuel injectors

Hello thanks for using 2CarPros. Do you still have power to both injectors? Power comes from ECM 1 20 amp mini fuse. Each injector is driven by a separate driver directly from the ECM on the ground side of the injector. There is a splice on the power wire. If there is no power I would try to trace the power wire back looking for a bad connection. Also the ECM needs a signal from one of the pick ups in the distributor to pulse the injectors. But let us know first if you still have power at both injectors.

Okay, now both injectors are controlled each on a different circuit, so no pulse on either injector I assume. Are you getting spark while the injectors aren't firing? Also assuming you have fuel pressure? Make sure your ground wires to the engine block are good and clean as well, I believe there are 2. The ignition module and pick up coils control signal to ECM for injector pulse so you know.

Do you have a purple/white wire at the distributor? If you can back probe it and look for a pulse there while cranking, thats the reference high signal wire, then the red/black wire is signal low, both going to ECM. Try unplugging the throttle position sensor as well. Just to make sure it's not shorted sending ECM into clear flood mode.

Okay, check the injectors ohms unplugged, make sure they're the not shorted out. Here's another test: Unhook the 4 pin harness from the back of the distributor.
Attach the clip of your test light to 12V positive.
Turn on the Ignition.
Tap the purple/white wire on the 4 pin dist harness (IC Reference High) with the test light probe; it should create a test signal and fire the injectors. I'm trying to find as many simple tests as possible for you.
Have you tried unplugging some sensors? TPS, MAP.
And does this truck have a security system?

Injectors usually have an ohm reading of around 15 ohms, low resistance can cause too much current flow to the ECM driver for the injectors causing it to burn out the driver. What was the reading on both of them? And did you get a pulse while back probing purple/white wire and the red/black wires at the distributor while cranking? These are the signal wires the ECM needs to fire the injectors. Since you have replaced so many components, I am suspecting a wiring issue. Possibly in the throttle body. Does the tachometer move while cranking as well? If you were able to pulse the injectors at the purple/white wire with your test light, that means the ECM has control and it's just missing the signal coming in to fire them. Also one more check just for good measures, check the grey wire at the map sensor for 5 volt reference signal. Just to make sure it's there.

Check all 3 wires at the map sensor grounding from the battery, the map should not have 12 volts, also check the grey wire at the throttle position sensor, this is the 5 volt reference as well. There should not be 12 volts. Check all 3 wires at the map for a 5 volt ref and let me know if it is there and do the check at the TPS.

Now if you have 12v on the grey wire at the tps, and I'm going to have you do this anyway, I want you to watch the 12v on the grey wire at the map and start unplugging fuses until the 12 v disappears. This way we can isolate the circuit that's shorted the 5v ref to 12v. You have a wire or wires somewhere that's shorted out together. Check all 3 wires at the map for a 5 volt ref and let me know if it is there and do the check at the TPS. There is one other quick test I want you to try, with your test light to battery ground, does the test light up touching that grey wire at the map sensor?

Good afternoon,

I thought I would help out as well.

The ECM should only provide 5 volts to the MAP sensor, TPS, and the EGR valve grey wire. If you have 12 volts, it is either a short in the harness to the 5-volt circuit or a bad ECM.

I attached a wire diagram for you to view the system.

Roy

Okay, are you getting 12v to the fuel pump while cranking? Here's some diagrams to check it correctly: https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, check the end wire on the EGR. I sent you a diagram that included the EGR. It should be 5 volts as well.

Roy

I sent you the complete diagram for the power train management system. There are 3 parts.

Let me know if you have an issue reading them.

Roy