ECMTuning - wiki

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<h1>2G DSM Alternator Control</h1> <div class="level1"> <p> This page provides a basic description of how the two wires running from the 2G DSM ECU to the alternator (G and FR) are used. </p> <p> There are four wires running to the alternator. Two wires are G and FR from the ECU. The other two are a voltage sense line (from the headlight circuit) and an "S" terminal tied into the gauges somehow. </p> <p> If you have the DSM manuals on CD, check out the "generator" section of the 2G technical manual. It provides a really good explanation of how the ECU controls the alternator. I'll briefly summarize below. </p> <p> The alternator has two "modes" - low voltage/low load and high voltage/high load. The ECU controls which mode the alternator should be in using the "Generator G" pin on the ECU harness (pin 33). When G is grounded, the alternator is put into low-voltage mode (around 12.3v). When G is left floating, the alternator is in high-voltage mode (Around 14.4v). </p> </div>