There is a problem with the transmission.
Count the blinks from the Transmission Control Unit's LED, located under
the forward part of the passenger's carpet. Pull the carpet back, turn the
ignition to "II" and read the blinks.
The PGM-FI ECU also has an LED, which may also be blinking a code, so count
those too, if needed. The ECU is next to the TCM.
Any unusual symptoms? Strange shifting behavior?
From my experiences and the documentation I have, Honda put an LED on the
face of the ECU and TCM up to 1991. This LED was activated whenever the
ignition switch was turned to "II".
For 1992 Honda did an across-the-board revision of all their ECUs and of
error-reading procedures. From that point on, you had to jump the Service
Check connector to read codes from lights on the dashboard. Prior to that,
the Service Check connector was only jumped when you were setting base
I could be wrong on the above, but I can't find evidence of that.
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