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1996 X-90 Idle Speed Controller Problem
#3
ahhh lost my post.....
is compression 185 cold or 195 hot, at sealeavle? not 100?
block egr hose, at main, golf Tee then end hose so cant suck air, idle ok now? acid test here.
the EGR is 100 off line at idle and if below 1MPH. and wideopen throttle.
no changes, still 300 ?
its not EGR for sure. if is lets fix it.

so is ISC,
measures 12ohms, DCR (dc resistance) at ISC coil pins, and wiggled, still, and not glitching to infinity? at ISC PINS?
ISC wires broken.
7vdc across 2 wires, running at 300? if not wires cut or ecu, bad. (0 to 14.7v possible, but 0 is closed, and 300-400 normal for 0v)
if 0v there, bad wires /ecu
if 7vdc there bad ISC if coil is 12ohms then ISC jammed closed. (1989/90 is 6 ohms for others reading this)

here is my 96 ECU, is yours same>?#
the transistor that fails is here. q017 is blown, easy fix. replace it. its like $1 part. or about it is a 25 watt transistor to handle that 12ohm DCR load.
the signal is 200 Hz square wave. any scope made can watch it.

2SC2562
G16b , usa almost all use this, or near close, min is stick shift version, btw.
http://www.fixkick.com/ECU/1996/96ECU.html
http://www.fixkick.com
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RE: 1996 X-90 Idle Speed Controller Problem - by fixkick - 05-11-2017, 02:38 AM

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