Well, it I poke around with the fluke on AC and find a 3 v terminal,
that would be it, I guess. I could start with the T and then check
86 and 87 to verify.
Faster than waiting 3-4 weeks for a chinee oscil kit to show up. I
am not set up for desolder/resolder lectronics repair like Jim is.
The question is: What controls the idle speed? I know there is the
EDS plug on the IP, and the dealie on the firewall with the numbers
to set the idles speed. BTW, i checked it today, and it is set up to
7 (of 7) so no help there. I'm guessing the tach signal goes into
the computer and then it sends a signal to the dealie on the firewall
could be a bad computer. If no signal at the KLIMA and no signal at
the tach, but we know the tach signal is good going into the
computer, then maybe the computer is bad.
Can't help you on the pins but I would suggest getting one of the
cheap little oscilloscope kits. $30 or less delivered to your door
by a certified agent of the United States gummint from a variety of
chinee vendors, a bit of soldering and you have a useful little
tool., good enough for car work.
Disclaimer: I have one but haven't soldered it up yet.
--R (sent from my miniPad)
On Dec 4, 2015, at 7:52 PM, Curly McLain via Mercedes
<mercedes@okiebenz.com> wrote:
Now that I have proven that a tach signal exists before it goes into
the computer, the next step seems to be to see if there is a signal
at the Klima and at the tach itself.
Does anyone know which pin on the KLIMA is the pin for the tach
signal? Could it be the RR pin that is labeled T?
If the signal exists at both places, then the problem os pretty much
isolated to the tach itself.
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