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(:groupheader:)!! Introduction <:vspace> You may want to reset your ECU because you want to clear a fault code or simply to let you ECU re-learn your settings again, say after a modification or change in fuel (octane). <:vspace> In summary [[Acronyms/classic]] Impreza's can be manually reset and [[Acronyms/new age]] Impreza's onwards have to reset using a tool plugged in to the diagnostics port. <:vspace> !! New Age (Denso) ECU Reset <:vspace> The Denso ECU's don't have a manual reset function like the JECS ones. The Denso units apparently have a non-volatile RAM, so even disconnecting the battery won't do it. The only way to reset these ECUs is via the OBDII diagnostics port using a computer. Until recently this has only possible at the main dealer or using other commercial solutions e.g. Delta Dash or SECS. <:vspace> What follows is a description of resetting your Newage ECU using [[http://code.google.com/p/ecuexplorer | ecuExplorer]] which, at the time of writing, is distributed free by TARI Racing. This software is described in more detail in the [[ECU diagnostics and data logging]] technical article. <:vspace> <:vspace> # Download and install the latest release of [[http://code.google.com/p/ecuexplorer | ecuExplorer]] # Connect up to the OBDII diagnostics port with reference to the [[connecting to your ECU]] technical article. # Turn on your ignition # Invoke ecuExplorer and select the Tools -> Reset ECU option as illustrated in the figure below. # To complete the reset, turn your ignition off, back on, then start your car. <:vspace> %center%Attach:ecuExplorer_rest_ECU_menu.gif | '''Figure 1 - ecuExplorer Reset ECU option''' <:vspace> !! Classic (JECS) ECU Reset # Ensure engine is at normal operating temperature, turn engine off # Locate the two ECU connectors, located under the steering column and consist of a black plastic male and female connector, and a green male female connector # With the ignition OFF connect black to black and green to green. # Turn on ignition, do not start the engine, depress the accelerator pedal to full throttle, then return it to the half-throttle position and hold for a few seconds, and then release # Engine Check lamp turns on # Start engine and then drive for at least one minute, keeping road speed above 11 Km/h. # ECU is now re-set. # At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs. # Stop the car and turn off the engine. # Disconnect the black and green connectors. # Job complete <:vspace> %center%Attach:classic_test_mode_connector.gif | '''Black and Green Connectors on Classic''' <:vspace> %right%'-Information source - ScoobyNet, author - wah-' <:vspace> * [[Reading ECU Codes]] (including fault codes) * [[ECU Fast Learning Trick]] * [[Connecting to your ECU]] * [[ECU Diagnostics and Data Logging]] * [[Reading and reflashing ECUs]] * [[Altering your ECU ROM image]](:groupfooter:) <:block>