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The code is for an ignition system problem in the IDM (ignition diagnostic monitor) signal.Here is the pinpoint test from the ford service manual.Unfortunately it requires a ford diagnostic tool.But if you look through the tests you can see the end results of each test to give you an idea where the problem may be.
Note: If voltage intermittently drops below 1.0 volt ac, GO to Z50 for intermittent diagnostics.
Is voltage greater than 1.0 volt ac?
Is voltage less than 0.5 volt dc?
Is resistance greater than 10K ohms?
Is resistance less than 5.0 ohms?
would this problem cause the engine to shut down for no reason and act as if it ran out of gas. you can spray starting fluid into the intake and it starts back up. the shops were never able to recreate the problem and there were never any error codes to go by. Ford dealer said they couldn't do anything unless the truck actually died and we had it towed in immediately after the shutdown without trying to start it again. The truck runs beautifully but the check engine light came on and the obd2 runs the error immediately.