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Ignition switch tied to ecm?

Old 05-16-2019, 08:53 PM
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Ignition switch tied to ecm?

Is the ignition switch programmed to the ECM, or are these trucks to old for that?
The reason I ask; I bought a wrecked 94 without a key and swapped over the ignition switch & key from my 94 gasser parts truck. Itíll fire right up, and then immediately die.
Only other thing I can think of is my brand new FSS could be bad out of the box?
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Old 05-17-2019, 02:40 PM
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The key is a "dumb" key - just a piece of metal easily duplicated at a hardware store/home store/whatever. Did you swap only the lock cylinder, or the actual ignition switch? If you swapped the switch itself, I'd suspect a wiring/connector issue first. It is also possible your FSS could be bad as you suggested - have you checked to see if you have voltage on the "hold" circuit when in "run" position?
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Old 05-17-2019, 08:12 PM
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I swapped the whole switch assembly. Iíll double check the wiring, and then check the FSS with my meter.
I was in a hurry to move the truck, and wanted to make sure I hadnít overlooked something stupid.
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Old 05-20-2019, 02:23 PM
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Why not check the FSS first? That will tell you which way you need to work from there...
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