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PGM-FI light comes on, led on PCM flashes 12 times

Car: Honda, Prelude Si, 1986, 2.0     -    Back to Fix-It    -    Honda Prelude Si Repair Manuals

Q.PGM-FI light comes on, led on PCM flashes 12 times, pauses then repeats. All quick flashes no long, one pause. any ideas?

I already checked/done: replaced EGR valve. checked vacuum lines, new plugs,wires,cap and rotor.

Answer OK.. we need to test the EGR control system.. Here are the possible causes of this code:
.. and here is how to check that sytem:

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