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Thread: Reading DTC codes without a scan tool (check engine light)

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  1. #1
    Senior Member lbarouf's Avatar
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    Jan 2015
    Ottawa, ON
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    Lightbulb Reading DTC codes without a scan tool (check engine light)

    Got the check engine light on?
    No fret... no need for an expensive (nor a cheap) ODB-II reader. Our 10k tin cans can read off the display.

    Jokes aside, it can become useful

    Here's how to read and reset:

    * Turn the ignition key to the ON position and wait three seconds. (Do not start the car.)
    * Fully depress and release the accelerator pedal five times in less than five seconds.
    * Wait exactly seven seconds.
    * Fully depress the accelerator pedal for ten seconds until the check engine light flashes.
    * Release the accelerator pedal and start counting flashes to obtain the four-digit trouble code.

    Long flashes (half seconds) indicate the first digit of the code; count the blinks one through nine and write down the first digit. (Ten blinks indicates a zero.) The next three digits follow in turn in the same fashion except with faster blinks (like a quarter of a second) and a 1 second pause between digits.

    The ECM code repeats intself until you turn the ignition key to the OFF position, at which point the ECM resets itself to standard get-in-and-drive-the-car mode. You can look up the trouble codes in the FSM if you have a copy, or online. If you get four blinks of ten (0000), the ECM is indicating no malfunction.

    You can clear the code (and the annoying check engine light) by holding down the accelerator pedal for more than 10 seconds while in the above mode. When you release the pedal, the ECM erases the trouble code(s).

    I hope this helps.


        click to view fuel log View my fuel log 2015 Micra S manual: 7.7 L/100 km ... 36.6 mpg (Imp) ... 13.0 km/L ... 30.5 mpg (US) ...

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