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

    Aug 7, 2008, 08:45 AM
    97 honda civic ex check engine light
    Used to come on after raining and then go out after a few drives. Now, has remained on. Neighbor hooked a diagnostic computer up to it and it didn't relay any codes. Removed the fuse (fuse 7.5) for 10 seconds and light still remains on. Any other suggestions?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Aug 7, 2008, 08:57 AM
    . Test all under-dash fuses with a test light or multimeter:

    https://www.askmehelpdesk.com/cars-t...tml#post252145

    Be thorough or you could end up wasting time and money.

    . Perform K-Test on ECM:

    The K-Test: Remove the MAP Sensor connector and turn the ignition switch to ON (Position II). Using a multimeter, check for 5 volts going between the MAP Sensor connector's reference wire (+) and ground. As you look at the connector, this is the socket on the right. Really press the black test lead into a cleaned main ECM ground on the thermostat housing. If the voltage is low, it's probably indicating ECM failure. Most failed ECMs will record a fraction of a volt. To me, the K-Test is simple, elegant, and accurate.

    Two other, though less likely, reasons for the CEL staying on are a bad main relay or ignition switch.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Aug 7, 2008, 09:37 AM
    What worked like a charm? What did the tests indicate was wrong?
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