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Tach defeats upshift light ? 200 1992

uid 27's pic
posted by  Art Benstein on  Sat Aug 12 14:20 CST 2006
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Hi Rob,

The yellow/red wire that plugs on the corner .187 tab runs the shift indicator lamp. It comes directly from the ECU and shares no circuitry with the tach.

The ECU has the RPM information from the ICU without needing connection to the coil, where your tach goes for it. It also needs the vehicle speed info from the speedometer, which if missing, should set a 311 if I read the book right.

As many times as you've had clusters out of the dash I'm sure you reconnected that little yellow/red wire, but if you want to verify that end of it, grounding 26 on the ECU plug should light the upshift lamp.

Also, just a vague memory, but I seem to recall someone saying the ECU has to reconstruct its shift point table after being powered down, as part of its adaptive behavior. Does that sound crazy as it does to me?
--
Art Benstein near Baltimore

Drive-In banks were established so most of the cars today could see their real owners. (E. Joseph Cossman)






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