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    msgray246's Avatar
    msgray246 Posts: 1, Reputation: 1
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    #1

    Oct 19, 2009, 08:18 AM
    1999 Honda's Malfunction Indicator Lamp stays on.

    A computer diagnostic on my 1999 Honda Accord showed Code P1607 (ECM/PCM internal circuit failure. Would rebuilding the existing computer eliminate the Malfunction Indicator Lamp light from coming on whenever temperatures drop below 55°. Could there be an underlying problem, such as a bad alternator, etc. that is the cause of the MIL light to light up? Or, would the rebuilding of the car's computer correct the engine problem?
    Thanks.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Oct 19, 2009, 11:04 AM

    There's a high probability that an underlying problem shorted out the ECM. Did you:

    . Jump the battery? Voltage spikes can damage the ECM, alternator, and sensors.

    . Replace an alternator without removing the negative battery cable first?

    . Splice wires or work on the electrical system without disconnecting the negative battery cable first?

    . Allow the car to go through high water?

    If none of the above happened, I would have your current ECM rebuilt, especially if you have an immobilizer system.
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