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Q:

running rough,misfiring,and spitting on 1990 Nissan Pickup (D21)

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i turn my ignition switch to the on position and look under my seat at the ecu the green light flash many times and then the red comes on an stays on an when i turn it to the diagnostics mode nothing changes the red light stays on
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(4) Comments
You cant read codes.when i turn my ignition switch on an look at my ecu obd it flashes the green light many times and then the red light comes on an will not go off and when you put it in diagnotic mode nothing changes.its like the ecu is locked up or its messed up or it has a wiring problem
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count the flashes with green light it should code out like 1 flash then pause then 2 or so flashes then on to the next code
The green light only flashes when you turn the ignition switch on an it goes off an doesnt come back on an then the red light comes on an will not go off. It doesnt give me any codes at all.its like the ecu is locked up.
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SEEK DIAG INSTEAD OF GUESSING THAT WORLD GET EXPENSIVE. TOW TO GOOD SHOP AND GET THEM TO INSP AND DIAG FOR U
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