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mpdtune
June 3rd, 2014, 08:57 AM
Ran into a weird issue with a DSP5 install on an LMM Duramax. Switch was working correctly for about 5 minutes then the voltage became stuck at 2.9 Volts, DSP Tune #1. Both Scan Tool and volt meter on DSP wire confirm this voltage. Tried a new DSP5 Switch, no change. Kind of at loss at this point, going to try another full reflash and see if that changes anything.

mpdtune
June 5th, 2014, 01:59 AM
Full reflash didn't change anything. I rescaled the DSP switch voltages in the tune to get it switching again. Not sure if it's a controller issue or something with the tune. Is there a driver or something in the PCM just for the 5 volts to the switch or is it a common power source from the 5 volt sensor reference?