ECMTuning - wiki

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<h1>Overview</h1> <div class="level1"> <p> With a 2G ECU, when removing the EPROM it's entirely possible to damage a track on the top of the board and still allow the engine to run, but cause a number of malfunctions. </p> <p> If the engine runs, it indicates that the connections between the processor (IC1) and the ERPOM are okay. </p> </div> <h1>Details</h1> <div class="level1"> <p> Check for continuity of the tracks to the EPROM as follows (note that there is a 100 ohm series resistor between EPROM pin 22 and IC2 pin 44): </p> <span class='np_break'> </span> <div class="table"><table class="inline"> <tr class="row0"> <td class="col0" colspan="2">EPROM</td><td class="col2" colspan="2">IC2</td><td class="col4" colspan="2">IC1</td><td class="col6" colspan="2">Notes</td> </tr> <tr class="row1"> <td class="col0" colspan="2">01</td><td class="col2" colspan="2">25</td><td class="col4" colspan="2">63</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row2"> <td class="col0" colspan="2">02</td><td class="col2" colspan="2">28</td><td class="col4" colspan="2">60</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row3"> <td class="col0" colspan="2">03</td><td class="col2" colspan="2">34</td><td class="col4" colspan="2">55</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row4"> <td class="col0" colspan="2">04</td><td class="col2" colspan="2">35</td><td class="col4" colspan="2">54</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row5"> <td class="col0" colspan="2">05</td><td class="col2" colspan="2">36</td><td class="col4" colspan="2">53</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row6"> <td class="col0" colspan="2">06</td><td class="col2" colspan="2">37</td><td class="col4" colspan="2">52</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row7"> <td class="col0" colspan="2">07</td><td class="col2" colspan="2">38</td><td class="col4" colspan="2">51</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row8"> <td class="col0" colspan="2">08</td><td class="col2" colspan="2">39</td><td class="col4" colspan="2">50</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row9"> <td class="col0" colspan="2">09</td><td class="col2" colspan="2">40</td><td class="col4" colspan="2">49</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row10"> <td class="col0" colspan="2">10</td><td class="col2" colspan="2">41</td><td class="col4" colspan="2">48</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row11"> <td class="col0" colspan="2">11</td><td class="col2" colspan="2">45</td><td class="col4" colspan="2">11</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row12"> <td class="col0" colspan="2">12</td><td class="col2" colspan="2">46</td><td class="col4" colspan="2">12</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row13"> <td class="col0" colspan="2">13</td><td class="col2" colspan="2">47</td><td class="col4" colspan="2">13</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row14"> <td class="col0" colspan="2">14</td><td class="col2" colspan="2"> </td><td class="col4" colspan="2"> </td><td class="col6">GND</td><td class="col7"></td> </tr> <tr class="row15"> <td class="col0" colspan="2">15</td><td class="col2" colspan="2">48</td><td class="col4" colspan="2">14</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row16"> <td class="col0" colspan="2">16</td><td class="col2" colspan="2">49</td><td class="col4" colspan="2">15</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row17"> <td class="col0" colspan="2">17</td><td class="col2" colspan="2">50</td><td class="col4" colspan="2">16</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row18"> <td class="col0" colspan="2">18</td><td class="col2" colspan="2">51</td><td class="col4" colspan="2">17</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row19"> <td class="col0" colspan="2">19</td><td class="col2" colspan="2">52</td><td class="col4" colspan="2">18</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row20"> <td class="col0" colspan="2">20</td><td class="col2" colspan="2"> </td><td class="col4" colspan="2"> </td><td class="col6">GND</td><td class="col7"></td> </tr> <tr class="row21"> <td class="col0" colspan="2">21</td><td class="col2" colspan="2">30</td><td class="col4" colspan="2">58</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row22"> <td class="col0" colspan="2">22</td><td class="col2" colspan="2">44</td><td class="col4" colspan="2"> </td><td class="col6">100 ohms</td><td class="col7"></td> </tr> <tr class="row23"> <td class="col0" colspan="2">23</td><td class="col2" colspan="2">29</td><td class="col4" colspan="2">59</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row24"> <td class="col0" colspan="2">24</td><td class="col2" colspan="2">31</td><td class="col4" colspan="2">57</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row25"> <td class="col0" colspan="2">25</td><td class="col2" colspan="2">32</td><td class="col4" colspan="2">56</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row26"> <td class="col0" colspan="2">26</td><td class="col2" colspan="2">27</td><td class="col4" colspan="2">61</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row27"> <td class="col0" colspan="2">27</td><td class="col2" colspan="2">26</td><td class="col4" colspan="2">62</td><td class="col6"> </td><td class="col7"></td> </tr> <tr class="row28"> <td class="col0" colspan="2">28</td><td class="col2" colspan="2"> </td><td class="col4" colspan="2"> </td><td class="col6">+5V</td><td class="col7"></td> </tr> </table> <span class='np_break'> </span> </div> <p> Pin numbers for IC1 and IC2 are printed on the PC board. The EPROM pins are numbered as follows: </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=e20703&media=http%3A%2F%2Fwww.dsmlink.com%2Fimages%2Fforums%2Fm27c512.gif" class="media" title="http://www.dsmlink.com/images/forums/m27c512.gif"><img src="/wiki/lib/exe/fetch.php?tok=e20703&media=http%3A%2F%2Fwww.dsmlink.com%2Fimages%2Fforums%2Fm27c512.gif" class="media" alt="" /></a> </p> </div>