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Re: '00 4.3ltr blazer won't start
Old Master, I hope we're on to something. All wires are showing good conitinuity end to end, (423, 573 & 574) from sensor sockets to PCM Blue connector "C1" socket #s 28 &31 .
Hooking up the white wire 423 at control module to a test light and battery POS, I get a solid illumination with no pulse while cranking.
Only problem I see contrary to your comment, "They also should show infinite resistance to ground." The yellow off the sensor showed no continuity to ground, however purple did. Would key being off while checking cause this?
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