ECMTuning - wiki

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<h1>V3 Hard Reset</h1> <div class="level1"> <p> In some rare situations, it may be necessary to do a hard reset of your V3 flash device (reset back to original defaults). The following describes how to do that. </p> <ol> <li class="level1"> Turn the ignition on (don't start the engine)</li> <li class="level1"> Wait for the CEL light to go back off after a few seconds just as a check that the ECU is up and running normally.</li> <li class="level1"> Press the throttle to the floor and keep it there as you cycle the ignition key off and then back on 3 or 4 times. I usually go for 4 but 3 is the minimum. Pause for just a moment between on/off switches (about a 0.5-second pause, but not more than 1.5 seconds).</li> </ol> <p> Once you have done that, the ECU should reset back to the hard coded defaults in the chip. </p> <p> Additional notes: </p> <ol> <li class="level1"> The vehicle speed must be zero.</li> <li class="level1"> ThrotPos must exceed 72%. (Verify by logging.)</li> <li class="level1"> Beginning with the ignition on but the engine not running, the minimum sequence is: turn the key off (first time) for 1/2 second, on for 1/2 second, off (second time) for 1/2 second, on for 1/2 second, off (third time) for 1/2 second, then on and leave on. (The speed of the off-on should be about like a clock going tick-tock or a bit faster. Failure to reset usually is caused by toggling the key too slowly.)</li> <li class="level1"> If you initiate logging prior to performing the reset sequence, the logging will halt (the seconds counter will stop updating) the instant the reset happens.</li> </ol> </div>