Rough Idle shows p0200 code

Asked by Nov 05, 2016 at 06:09 PM about the 2003 Chevrolet Blazer 4 Door LS

Question type: Maintenance & Repair

I have come to a halt on the repair of my 2003 Blazer. The problem started
with rough idle and it throwing a p0200 and p0305 code. I ohm tested the
injectors and found that #5 had an open connection (no continuity.) the rest
tested normal. I replaced the whole spider assembly this morning only to
find the p0200 error is still present. I am getting 12v to all positve leads in
the injector harness and i cannot locate the negetive wire going back to the
PCM as I cannot locate a wiring diagram for this model. (2003 blazer 4.3
with the Green/Blue connectors at the pcm.) I guess my question is if
anyone can provide a wiring diagram, and if there is a way to test if it is in
fact a faulty PCM, or a short in the wire going to the injector.

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