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<h1>2G Socket Checkpoints</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 EPROM 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"> <thead> <tr class="row0"> <th class="col0"> EPROM </th><th class="col1"> IC2 </th><th class="col2"> IC1 </th><th class="col3">Notes </th> </tr> </thead> <tr class="row1"> <td class="rightalign"> 01</td><td class="rightalign"> 25</td><td class="rightalign"> 63</td><td class="col3"> </td> </tr> <tr class="row2"> <td class="rightalign"> 02</td><td class="rightalign"> 28</td><td class="rightalign"> 60</td><td class="col3"> </td> </tr> <tr class="row3"> <td class="rightalign"> 03</td><td class="rightalign"> 34</td><td class="rightalign"> 55</td><td class="col3"> </td> </tr> <tr class="row4"> <td class="rightalign"> 04</td><td class="rightalign"> 35</td><td class="rightalign"> 54</td><td class="col3"> </td> </tr> <tr class="row5"> <td class="rightalign"> 05</td><td class="rightalign"> 36</td><td class="rightalign"> 53</td><td class="col3"> </td> </tr> <tr class="row6"> <td class="rightalign"> 06</td><td class="rightalign"> 37</td><td class="rightalign"> 52</td><td class="col3"> </td> </tr> <tr class="row7"> <td class="rightalign"> 07</td><td class="rightalign"> 38</td><td class="rightalign"> 51</td><td class="col3"> </td> </tr> <tr class="row8"> <td class="rightalign"> 08</td><td class="rightalign"> 39</td><td class="rightalign"> 50</td><td class="col3"> </td> </tr> <tr class="row9"> <td class="rightalign"> 09</td><td class="rightalign"> 40</td><td class="rightalign"> 49</td><td class="col3"> </td> </tr> <tr class="row10"> <td class="rightalign"> 10</td><td class="rightalign"> 41</td><td class="rightalign"> 48</td><td class="col3"> </td> </tr> <tr class="row11"> <td class="rightalign"> 11</td><td class="rightalign"> 45</td><td class="rightalign"> 11</td><td class="col3"> </td> </tr> <tr class="row12"> <td class="rightalign"> 12</td><td class="rightalign"> 46</td><td class="rightalign"> 12</td><td class="col3"> </td> </tr> <tr class="row13"> <td class="rightalign"> 13</td><td class="rightalign"> 47</td><td class="rightalign"> 13</td><td class="col3"> </td> </tr> <tr class="row14"> <td class="rightalign"> 14</td><td class="leftalign"> </td><td class="leftalign"> </td><td class="col3">GND</td> </tr> <tr class="row15"> <td class="rightalign"> 15</td><td class="rightalign"> 48</td><td class="rightalign"> 14</td><td class="col3"> </td> </tr> <tr class="row16"> <td class="rightalign"> 16</td><td class="rightalign"> 49</td><td class="rightalign"> 15</td><td class="col3"> </td> </tr> <tr class="row17"> <td class="rightalign"> 17</td><td class="rightalign"> 50</td><td class="rightalign"> 16</td><td class="col3"> </td> </tr> <tr class="row18"> <td class="rightalign"> 18</td><td class="rightalign"> 51</td><td class="rightalign"> 17</td><td class="col3"> </td> </tr> <tr class="row19"> <td class="rightalign"> 19</td><td class="rightalign"> 52</td><td class="rightalign"> 18</td><td class="col3"> </td> </tr> <tr class="row20"> <td class="rightalign"> 20</td><td class="leftalign"> </td><td class="leftalign"> </td><td class="col3">GND</td> </tr> <tr class="row21"> <td class="rightalign"> 21</td><td class="rightalign"> 30</td><td class="rightalign"> 58</td><td class="col3"> </td> </tr> <tr class="row22"> <td class="rightalign"> 22</td><td class="rightalign"> 44</td><td class="leftalign"> </td><td class="col3">100 ohms</td> </tr> <tr class="row23"> <td class="rightalign"> 23</td><td class="rightalign"> 29</td><td class="rightalign"> 59</td><td class="col3"> </td> </tr> <tr class="row24"> <td class="rightalign"> 24</td><td class="rightalign"> 31</td><td class="rightalign"> 57</td><td class="col3"> </td> </tr> <tr class="row25"> <td class="rightalign"> 25</td><td class="rightalign"> 32</td><td class="rightalign"> 56</td><td class="col3"> </td> </tr> <tr class="row26"> <td class="rightalign"> 26</td><td class="rightalign"> 27</td><td class="rightalign"> 61</td><td class="col3"> </td> </tr> <tr class="row27"> <td class="rightalign"> 27</td><td class="rightalign"> 26</td><td class="rightalign"> 62</td><td class="col3"> </td> </tr> <tr class="row28"> <td class="rightalign"> 28</td><td class="leftalign"> </td><td class="leftalign"> </td><td class="col3">+5V</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>