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cold start

Hi everyone,

I am still looking for the high idle problem on my 86 5kcst. Found that
cold start valve is receiving only 3 volt pulses when activated at the fuel
relay. According to the wiring diagram ECU switches the ground for that
circuit, therefore I tend to suspect its output at terminal 1. My question
is: where can I get the ECU wiring diagram and is it possible to get inside
it without irreversible damage? Any input on the subject would be greatly

86 5kcst   120k (resting)
87 5ks  150k(getting better everyday)