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Originally Posted by QuasiMondo
I redid the sensor wiring today. Took her out on a run....and got the same results(!) So I went back, double checked the wiring, and verified voltages. All were good. So I figured that I have the sensor tapped into the wrong vacum port, and even pulled the hose off to see if it would read any different, no change.
Then it hit me like a light bulb. I remembered that when I first upgraded the MMCD software, I saw two MAP readouts, one matched what I would expect, and the other didn't move. I selected the one that didn't move, and it worked.
Sweet success of mine!!!!!!
Then I got to thinking about why it didn't work before, and I remembered what Clint said about what the EGRT would read when nothing is connected to it. Turns out that when I had the MAP sensor wired in backwards, the EGRT saw nothing because pins 4, 5, and 6 were open. No different than if I had nothing there.
So what about the 'other' MAP reading? I got the sensor working right, I did a few runs, graphing both readings side-by-side. I discovered that the 'bad' MAP reading would peak right around 10 psi on the 'good' MAP reading. I also noticed that the factory boost gauge would hit its peak around the time the mechanical gauge reached 10 psi. This leads me to believe that the 'bad' MAP reading is actually what the factory boost gauge reads.
So to sum it all up, the wiring colors for DSM's is correct. If you're using MMCD, make sure that you're selecting the first MAP reading (the one after TPS) and not the second one (listed with the eight new inputs)
Many thanks for the help on this, Clint. With your permission, I'm going to put your FAQ on dsmtalk.com, they've been asking about it. I'm also going to see if any GVR4 people have done this as well so they can tell us what wiring colors they use, I'm sure it's going to be different as well.
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Sorry for the confusion caused by the version of MMCd you are using that had HSLogger expansion channels pre-configured on page 4. (HSLogger is a new high speed expansion unit that supports higher baud rates, additional high speed analog sensor inputs and odometer/speed.)
Without the HSLogger expansion unit, the MAP sensor on sensor page 4 would be reading data from ECU register E0 which I believe on a DSM is airflow - which from a distance looks kind of like boost.
Again, sorry for the confusion and any time you wasted but happy to hear that you were successful. (Also good to know that hooking up the sensor backwards using pins 4-5-6 does not cause any damage.)
Two features to check out that I think you will enjoy.
1. Check out the peak/hold/reset function as well as the Min/Max in big number mode. (I leaned more about my car from using peak than I did in months of logging.)
2. Check out the autolog trigger in the alarm configuration. If you set up autologging trigger on KNOCK>3 it will automatically start the log whenever you get knock.
Actually it is much better than that. There is a pre-log that provides several seconds of data BEFORE the trigger and a post-log that will turn off logging in 30 seconds if there are no more triggers.
Setting up a trigger on TPS > 70% allows you to automaticlly log every WOT run.
You can also use the smart O2 alarms which are only active when TPS > 80% so you can alarm/log on O2 < .91 or whatever value you desire.
NEXT MMCd VERSION
Next version of MMCd will have a number of DSM / 3SI configurable options as other options to support new HSLogger functions. ETA ~ 1 week.
Clint