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Do you have a DVOM to measure the resistance of each fuel injector?
Hi Jon. DVOM is Digital Volt Ohm Meter. Code 81 can mean a few things from a bad ECM to a shorted injector. Step 1 would be measuring all 8 injectors and seeing if any of them show a short. Is that something you can have done and get back to me?
Sounds good, let me know what you get for readings on each injector and we can take it from there.
Got it. The next thing would be to measure the voltage at each bank of injectors with the engine running. Do you know what the actual votlages are reading?
I would personally check the voltages before swapping the ECM.
Hi, my name is Kerry
I don't know what your voltages should be, I don't have a manual, however I can tell you
that swapping the ECUs won't hurt them. Just make sure you disconnect the batteries before
If the problem moves to the other engine, you have an ECU to replace.
If it stays on the same engine you have some other problem, possibly a sensor.