from what i've looked at 2006 is the change over for the immobilizer function to be completely ecm based in chrysler vehicles; before that it was more looked at as an option, specifically before 2000 model year. my 99 tj(wrangler) has a fuse i can tap to turn off the ignition and fuel injectors it's part of the immobilizer function. 2001 to 2005 has a relay that can be by-passed if clever.
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