Samurai TBI | No Injector Pulse

[fixkick]

something must have caused it , yes that is wise thinking
but not true, always,
all parts made by man fail
the hotter running parts love to fails first. power transistors top this list. and CAPS are top of top of list always , RECAP it?)
bad luck
entropy.
age.
none of those are someone.
top failures in this ECU are all electrolytic caps failed,

the ECU is really microcontroller, there,
and has VRM voltage regulators, none are LDO rated.
the caps go bad (dead zero uF) and now the regulator goes NUTS, on and off line over and over.
see this vast times even all relays to ECU clacking like mad.
so the CPU inside never stays booted up, it just reboots endlessly and in this mode the injector never goes on LINE.
#1 all time classic failure and covered in my bad ECU page. fully, leaking acid caps and all,
a cap that looks bad is
a cap that looks ok sure can be bad even dried out inside where you can not see.

what happens above is the CPU inside resets endlessly,do to BAD POWER regulation.
power is king if power is weak or full of noise, you have very very serious problem in electronics, for sure inside any ECU.

I test my transistors and the are good (example)
i then scope the base drive of each transistor with my scope and scope signal is dead or wild crazy spikes.
i then see power to the chips 5vdc is full of noise.
bad power it is.
recap it now.