#5571, "Issue with Standalone MSnS & MSD dis2" Sep-09-12 10:08 AM by eclipse982nrRST
So, here is the issue I am having. After the car sat for the last 4 years, I finally got back on it and finished it enough to where I was HOPING to here it fire for the first time. Car is setup to run full standalone off msns, oem ecu and alll wiring is trashed.
Here are the issues I am having, obviously I am in my rust brain stage.
I had the dis2 trigger wires wired inline with the two trigger wires from the ms ecu. No spark. Had no power to the coil. So I decided to remove the dis2 and try to fire the coil from the ms itself, however, there are no internal ignitors in the ms which I thought there were, but there at not.
So, I am trying to figure out how to properly wire the dis2 and Megasquirt together. I did have the bypass plug that came with the dis2 installed but I obviously do not need that bypass plug since I will not need an extra connector to plug into a "factory" coil or whatever the purpose of that is. I did buy the dis2 used from CI Motorsports but they said it was working. The brown/orange wire out of the dis2 has no power coming out of it to the coil, but I may have something wired incorrectly. So, if anyone out there can tell their thoughts of how the dis2 should be wired with the msns, that would be greatly appreciated and maybe get me on a little ways to getting some spark out of these units.
Here is the general diagram from MSD of how the dis2 should be wired..
#5572, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 0
To my knowledge the DIS 2 cant not fire coils directly. You would need to run a transistor pack off of MS and then run that to the DIS 2. There is no point in running the MSD so I would remove it. Either add the mosfets to MS to fire coils directly or use a 4g63 transistor pack.
#5573, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 1
Originally posted by SilvrEclips To my knowledge the DIS 2 cant not fire coils directly. You would need to run a transistor pack off of MS and then run that to the DIS 2. There is no point in running the MSD so I would remove it. Either add the mosfets to MS to fire coils directly or use a 4g63 transistor pack.
Can anyone else confirm this?
I just called MSD and they said I will not see voltage on the wire coming out of the MSD since it is a Capasitive Discharge Unit, I would need to check it with a oscilliscope. Anyways, the LED lights on the side of the ECU no longer flash when cranking, so to my thinking, there is no signal from the MS ECU to the dis2 to fire the coil. The tech from MSD also told me I need to set the dwell time in the MS ECU to around 2.5 m/s, since that is what the MSD is looking for. I am honestly not sure of what it is at now. I was using Megatune still which aparently is outdated as hell, so, I downloaded TunerStudio and ordered a DB9 to USB cable online so I can use my new laptop to check with TunerStudio, since the old laptop was only used for MS with WINDOWS 95! HAHA.
So at this point, I guess I need to find out why those LEDs are night lighting...Is there a way to check the two trigger wires out of the MS ECU to see if there IS or IS NOT a signal from the MS ECU to determine if the ECU is damaged or not?
#5574, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 2
Originally posted by eclipse982nrRST
Originally posted by SilvrEclips To my knowledge the DIS 2 cant not fire coils directly. You would need to run a transistor pack off of MS and then run that to the DIS 2. There is no point in running the MSD so I would remove it. Either add the mosfets to MS to fire coils directly or use a 4g63 transistor pack.
Can anyone else confirm this?
That would defeat the purpose of having an MSD box. It can drive the ignition coil directly...
Originally posted by eclipse982nrRST So at this point, I guess I need to find out why those LEDs are night lighting...Is there a way to check the two trigger wires out of the MS ECU to see if there IS or IS NOT a signal from the MS ECU to determine if the ECU is damaged or not?
It depends on how your ECU is configured. As we discussed on AIM, the LED's indicate the ECU is sending a spark signal. If they're not blinking while the engine is cranking, the ECU isn't sending a signal. This could be due to having the wrong settings or a damaged processor.
I suggest posting pictures of the board, so we can determine how it was configured, plus a copy of your MSQ file.
#5576, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 4
Originally posted by eclipse982nrRST I will get some pics up tonight of the ECU and try to load up a MSQ. Im hoping its just a F'd up setting. Can't I just take a test light from a positive source and check the trigger wires out of the ECU to see if the signal is occuring?
You could do that if the ECU has internal ignitors, otherwise the test light will probably destroy the processor pins (~20mA max.). If the ECU doesn't have internal ignitors, there isn't much to test anyway. If the settings are correct and the LED's aren't flashing, the processor is damaged.
#5577, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 5
Originally posted by VelocitaPaola
Originally posted by eclipse982nrRST I will get some pics up tonight of the ECU and try to load up a MSQ. Im hoping its just a F'd up setting. Can't I just take a test light from a positive source and check the trigger wires out of the ECU to see if the signal is occuring?
You could do that if the ECU has internal ignitors, otherwise the test light will probably destroy the processor pins (~20mA max.). If the ECU doesn't have internal ignitors, there isn't much to test anyway. If the settings are correct and the LED's aren't flashing, the processor is damaged.
Gotcha. I believe it does not have internal ignitors. I will open it up and take some pics of the ECU tonight and get them uploaded.
I will try and get a MSQ tonight too, never loaded one before so we will see how that goes
#5579, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 7
Laptop being used is too old to even save a MSQ to a cd to transfer, so I took some pics of the screens with the spark settings and also an error at start up. I have since downloaded TunerStudio to my new laptop and am waiting for the DB9 to USB cable to arrive in mail to upload MS software to this new laptop. For now, does this do us any justice in finding an error anywhere?
#5580, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 8
Geez, you picked the worst possible way to share your MSQ file...
Your ECU doesn't have internal ignitors, the "Trigger Angle" field should be set to 69, and the "Distributor (MSnS)" field should be set to "Off*^". There's still a chance the processor is damaged, but the incorrect "Distributor (MSnS)" setting would definitely cause the ECU not to send spark signals.
#5581, "RE: Issue with Standalone MSnS & MSD dis2" In response to Reply # 9
Originally posted by VelocitaPaola Geez, you picked the worst possible way to share your MSQ file... Your ECU doesn't have internal ignitors, the "Trigger Angle" field should be set to 69, and the "Distributor (MSnS)" field should be set to "Off*^". There's still a chance the processor is damaged, but the incorrect "Distributor (MSnS)" setting would definitely cause the ECU not to send spark signals.
Went out and fixed the settings, still no LED's. So I take the processor is damaged...awesome, just fucking awesome!
