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<h1>GM 3 or 3.3 Bar Installation Example</h1> <div class="level1"> <p> This installation example covers both the GM 3 and 3.3-bar sensors. The detailed instructions below are specific to the installation of this sensor on a 2G DSM using the MDP sensor input. Most of the general instructions still applies to other platforms (e.g., 1G DSM) or other inputs (e.g., intake temp). You'll just need to tailor the specific parts to your specific situation. </p> <p> Thanks to Martin Check for providing the original instructions! </p> </div> <h2>Parts needed</h2> <div class="level2"> <ol> <li class="level1"> GM 3 bar map sensor from <a href="http://www.gmpartsdirect.com" class="urlextern" title="http://www.gmpartsdirect.com" rel="nofollow">http://www.gmpartsdirect.com</a>. Part number info can be found at the bottom of <a href="/wiki/doku.php?id=externalsensorlist" class="wikilink1" title="externalsensorlist">this page</a>.</li> <li class="level1 node"> Map sensor harness<ol> <li class="level2"> Off of a camarobird (or other GM car) in a junkyard</li> <li class="level2"> OR you can get it from NAPA P/N 784524 - GM Weather Pack Triple Male w/seal Housing. You will also need male pins for this connector, since it is just an empty shell.</li> <li class="level2"> OR you can get the connector pre-assembled from GM, the part number is 15305891.</li> </ol> </li> <li class="level1"> Vacuum hose (one foot will be plenty)</li> <li class="level1"> T connector to splice into the intake manifold boost/vacuum source</li> </ol> </div> <h2>Tools needed</h2> <div class="level2"> <p> Xacto knife/razor blade, and some vampire connections (or a soldering iron if you plan to solder your connections), and of course some zip ties. </p> <p> This VFAQ will assume you have the junkyard MAP connector harness, or you have already assembled your store bought connector </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=252c9e&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_and_harness.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/map_and_harness.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=56791d&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_and_harness.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> <p> Now I assume you know how to find the MDP sensor. It is the sensor that sits on top of the intake manifold of a 2G. Unplug the electrical connector, but leave the sensor installed in the intake manifold. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=e1b46f&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fstock_map.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/stock_map.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=8225e3&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fstock_map.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> <a href="/wiki/lib/exe/fetch.php?tok=b93148&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_unplugged.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/map_unplugged.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=c43f93&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_unplugged.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> <p> Try to insert the empty Weather Pack connector into the MAP sensor. It won't go! See those little tabs inside the MAP sensor holes? Well, you have to make slits with a razor in the connector you bought to match. Here is what it looks like before: </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=d1ea9f&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_plugs.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/map_plugs.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=b38818&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_plugs.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> <a href="/wiki/lib/exe/fetch.php?tok=0c8c1d&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_and_harness_pins.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/map_and_harness_pins.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=048057&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_and_harness_pins.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> <p> And here it is after the cut: </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=7b2bdf&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_and_cutharness.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/map_and_cutharness.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=26a3ae&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fmap_and_cutharness.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> <p> Here are the connections: </p> <span class='np_break'> </span> <div class="table"><table class="inline"> <thead> <tr class="row0"> <th class="leftalign"> MAP </th><th class="leftalign"> Function </th><th class="leftalign"> MDP </th> </tr> </thead> <tr class="row1"> <td class="centeralign"> A </td><td class="centeralign"> Ground </td><td class="leftalign"> Black </td> </tr> <tr class="row2"> <td class="centeralign"> B </td><td class="centeralign"> Signal </td><td class="leftalign"> Light green-black stripe </td> </tr> <tr class="row3"> <td class="centeralign"> C </td><td class="centeralign"> +5 Volts </td><td class="leftalign"> Green-yellow stripe </td> </tr> </table> <span class='np_break'> </span> </div> <p> If you want to solder, that is best, but I just used vampire taps. Tap the connector into the appropriate lines. </p> <p> That's about it. Hook up the vac lines. Use a zip tie around each connection. </p> <p> Tape up your wires with electrical tape, and secure your map sensor somewhere safe. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=1ffeb2&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fnewmap_installed.jpg" class="media" title="http://www.ecmtuning.com/images/forums/gm3barinstall/newmap_installed.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=7e5f8d&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fgm3barinstall%2Fnewmap_installed.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> <p> Pictured below is the GM 3.3 MAP sensor (pt#9373269) and pigtail (pt#88987997) for comparison. The sensor is labeled from the factory with wiring pinout. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=0e96cc&media=http%3A%2F%2Fimg2.imageshack.us%2Fimg2%2F7665%2F33bar.jpg" class="media" title="http://img2.imageshack.us/img2/7665/33bar.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=cbb16b&media=http%3A%2F%2Fimg2.imageshack.us%2Fimg2%2F7665%2F33bar.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> </div> <h2>Further sensor identification</h2> <div class="level2"> <p> How to identify a GM MAP sensor: </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=c0f132&media=http%3A%2F%2Fi34.photobucket.com%2Falbums%2Fd119%2FRobie01%2FProjects%2FMAP%2Fmapsensor.jpg" class="media" title="http://i34.photobucket.com/albums/d119/Robie01/Projects/MAP/mapsensor.jpg"><img src="/wiki/lib/exe/fetch.php?w=160&h=120&tok=ceb6dd&media=http%3A%2F%2Fi34.photobucket.com%2Falbums%2Fd119%2FRobie01%2FProjects%2FMAP%2Fmapsensor.jpg" class="media" title="Click to enlarge" alt="Click to enlarge" width="160" height="120" /></a> </p> <p> 3 digit numbers for identification: </p> <span class='np_break'> </span> <div class="table"><table class="inline"> <tr class="row0"> <td class="centeralign"> 1 Bar </td><td class="leftalign">039, 460, 883, 876 </td> </tr> <tr class="row1"> <td class="centeralign"> 2 Bar </td><td class="col1">886, 012, 539, 609, 701</td> </tr> <tr class="row2"> <td class="centeralign"> 3 Bar </td><td class="leftalign">749, 861 </td> </tr> </table> <span class='np_break'> </span> </div> </div>