Question about 1995 Dodge Spirit

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Code 12 1995 dodge spirit 2.5 battery and PCM NOT disconnected. where does the pin 3 on PCM gets its battery suppy voltage from

Car runs very rough. Not driveable code 12 shows. look it up. Battery and computer was NOT disconnected. code 12 says no battery voltage at pin 3 on PCM where does that wire to pin 3 connect to get battery voltage

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  • George Hawkes Feb 24, 2012

    Jeremy W
    I'm new at this site and do not know how to contact you
    Per your questioin the battery is FULLY charge.
    George

  • Jeremy W.
    Jeremy W. Feb 24, 2012

    I get an email when you comment. I will get back to you as soon as I can.

    Ignore the code 12. Does not have anything to do with you problem.

    Concentrate on the items I described below. If there was no power to the PCM at any of the power supply pins (one constant and 2 ignition, from memory there may be one more) than the vehicle would not start at all.

  • George Hawkes Feb 24, 2012

    Jeremy W
    With all spark plugs removed the compression in each cyl is 140 to 150.
    I have change the spark plugs wires, dist cap, rotor sensor in dist.
    I also change the o2 sensor had 150000 miles on it and also the egr valve.
    once in a while the engine will start normal and run fine for a short time like a few minutes
    Then runs rough and little power.
    Can a bad fuel pump make it run normal for a few minutes then run poor again??
    Thanks for taking the time with my problem
    George

  • Jeremy W.
    Jeremy W. Feb 24, 2012

    Check spark on the coil wire with an adjustable spark tester. You should see at least a half inch of hot blue spark. If it is orange or not sparking than maybe you have a bad coil.

    Another thing you can do when it starts to run rough is unplug the coolant temp sensor located near the t-stat housing. If the idle drops and the engine smooths out than there may be an issue with the temp sensor giving the wrong signal.

    here's another thing you can try. When its running rough try adding a couple of shots of carb spray into the throttle body. If the idle smooths out than there is a fuel issue or you may have a vacuum leak.

    give those three a shot and let me know what you find and we'll go from there.

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  • Dodge Master
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Has the battery been disconnected or been low on charge in the last 50 ignition cycles?

Code 12 means that battery power has been disconnected within the last 50 ignition cycles. it does not mean there is no battery power to the computer

Pin 3 should be a red/white wire that is the constat power supply to the PCM. It is protected by a fusible link located neer the drivers side strut tower. If that link was bad the car would not start or run as it also supplieds power to the asd relay, fuel pump relay, and the ssd relay.

I would put money on the the problem being igntion (plugs wires cap rotor), compression (low cylinder compression usually cylinders 2 and 3), lack of fuel delivery (low fuel pressure, a weak or dirty injector), timin (timing belt jumped, worn distributor, look exciter ring), or possibly a plugged catalytic converter.

I would check compression first especially cylinders 2 and 3. It was pretty common for the head gasket to fail in between these two cylinders.

Posted on Feb 24, 2012

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