06-01-2013, 11:27 AM
Join Date: Mar 2012
Location: Northwest Indiana
Total Cats: 0
EBC not grounding well when connected to MS
Hey guys. I just added the DIYAutotune EBC to my car yesterday. I'm attempting to test it out and make sure it works before turning it on in TunerStudio.
It doesn't work due to what I believe is a bad ground when ran thru MegaSquirt.
I wired and plumbed everything according to the manual/Brain's doc I got with my MS3/forum documentation. I am sure the plumbing is correct, I've tested it with the blow thru method both with the power off and with the power running. You can see the difference as to where the air flows when the conrtoller is grounded or not grounded.
My MS3 did not have a lead off of the center connector for the boost control, the unused wires in the center connector were labeled as direct injection, so I clipped the boost control wire from the other side of the central connector and ran my signal wire from the boost controller directly to the harness.
Here's my issue:
0 volts anywhere, regardless of ground location. I can blow thru either side of the controller and air comes out the other side of the plumbed route, not the unused port.
When I run my multimeter to the blue switched power plug and a chassis ground, I show 11.84v and the box will click on/off as the wire is grounded/removed from ground. (This is how I tested the plumbing with the blow thru method. When it kicks on, you can blow thru the wastegate connection and air is let out of the unused port on the other side of the controller). When I blow thru the wastegate plumbing, air only comes out of the unused port.
When I run my ground thru the signal lead to MS (which should also act as a ground) I show 8.41 and the box no clicky.
Same as above, voltages increase to 14.30 when grounded to chassis, and 9.77 when grounded thru MS boost control lead off of the harness. Again, when I blow thru the wastegate side, air comes out of the unused port only.
Based on the difference between grounding to chassis and grounding to MS, I think when the signal wire is connected to MS it is not grounded well enough to click the controller on. If I had a bad ground in the ecu, wouldn't I see other symptoms in every day use of the car?
As always, any input is appreciated.