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Do you have a way to check for codes? and if so are there any codes? When was the last time this engine ran? Did it die while driving or after other repairs were made? How did you determine it has no injector pulse? Do the injectors have battery voltage supplied to them?
It sounds like you are able to hook a scanner up to this and read dat. Does it have a RPM reading during cranking? For this system to have injector pulse the PCM needs to receive a signal from the ignition module. Are you equipped and familiar with testing square wave signals?
The signal wire from the ignition module to the Engine Computer is the yellow/red wire. The ignition module should have a good crankshaft position sensor signal based on the fact that you have spark. One thing to keep in mind is that the ignition module is stand alone, you could unplug the engine computer and still have spark.
I was an Isuzu Master Technician. I used to work on these things when they were new. Used to find lots of loose grounds on the intake manifold after people had worked on these things. The ECM gets its ground there. A bad ECM ground could cause your type of problem.
I hope this was helpful information and led you to fixing your problem. Thanks
Ok , I just realized that the Diagrams the Motor provide for this year were incorrect. This year does not have an ignition module and coil packs and also doesn't utilize the signal from the ignition module. I am now wondering if the injectors have good voltage supply to them. A test would be to find the injector wires at the PCM and see if when you tap the to ground, if the injectors actually click and cause a drop in fuel pressure. I have wiring diagrams but not sure best method to get them to you.
this is the one with the injector circuits
here is another useful one. see if you have a 5 v reference to the cam and crank sensor and the Throttle position sensor.
Let me know if need any thing else
Hope you got something figured out on your Rodeo and got it up and running.
its been awhile and I never heard whether you got your rodeo running or not.