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ECU is bad

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    #1

    ECU is bad

    Ok I was driving down the road to work yesterday morning when my radio turned itself off my rpm and speedometer gauges both fell to 0 as well as my turning signals stopped. The car will set and idle but when I put it in gear it sputters badly and won't go anywhere and sometimes it won't let me get it out of park. We replaced the battery with a new one and it will crank and idle normally so we ruled out the altenator. So my question is would the p12 ecu from a f22a1 prelude work? Thanks.
    Tags: None
    #2
    The search function would have answered this for you.
    If you have the f22a1 or a4, then yes. If you have an a6, it will work, but you'll lose the secondary butterflies activating, and it's not really mapped for the more aggresive cam.

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      #3
      Ok so I replaced the ECU but the car is still acting crazy. Hooked the battery up to a battery charger and car starts fine and will run fine for a minute. However it slowly starts to bog down and eventually shuts off. When it does this the gears in the gagues have a square around P and D4. Anybody have any ideas?

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        #4
        Sounds like a broken ground to me. Check all grounds and electrical connections.

        I don't know how you arrived at the bad ECU conclusion... there's nothing that suggests that at all.






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          #5
          Originally posted by WP'sFinest View Post
          Ok I was driving down the road to work yesterday morning when my radio turned itself off my rpm and speedometer gauges both fell to 0 as well as my turning signals stopped. The car will set and idle but when I put it in gear it sputters badly and won't go anywhere and sometimes it won't let me get it out of park. We replaced the battery with a new one and it will crank and idle normally so we ruled out the altenator. So my question is would the p12 ecu from a f22a1 prelude work? Thanks.
          use a volt meter and check the batt voltage when the car is running should be aprox 14.5 volts , you might have a bad alternator..... if you replaced the battery with a new one and it cranked and and idled normally , that doesnt mean your alternator is charging.....

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            #6
            Originally posted by deevergote View Post
            Sounds like a broken ground to me. Check all grounds and electrical connections.

            I don't know how you arrived at the bad ECU conclusion... there's nothing that suggests that at all.
            Thanks deev I am gonna check everything again tomorrow when I have some daylight.

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              #7
              The battery cables are another thing that can cause problems. Make sure they are clean and tight. I've had my car shut off while driving due to loose/dirty cables.

              old honda tek has a point, but if the alternator wasn't working, the battery would end up being completely dead after the car has been running for a bit. It would be running off of battery power only. That IS a possibility, but it doesn't sound like the case from your description.






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