87 ranger 2.9 v6 auto 2 wd , diagnosing a electrical and possible
computer control problem i found in the cluster that there was no
check engine bulb none at all no receptacle and no bulb
also the printed circuit wasnt even punched out for one , is this
right or did someone change the cluster? its really freakng me out
because i cant figure out why my diagnostic reader wont communicate
with the processor......any help will be greatly appreciated....mike
You are looking at an early EEC-IV. Those did not have a CEL. Diagnostics
are rather limited - don't expect a lot.
All the 'communication' between the test connector and the computer consists
of grounding one pin and counting pulses coming out on another. If the
engine is running at all, I would rather suspect your reader than the
computer. Does it work on another vehicle?
You don't really need a 'reader'. A paper clip and a test light accomplish
exactly the same thing. Google archives of this group for details how to
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