EDIS4 - No PIP output

[mic2377]

Hi All,
Having what I think is some bad luck with EDIS4 modules. I have been bench testing an EDIS4 setup - 36/1 trigger wheel, stock VR sensor.

The issue I am having is no RPM output to MS from PIP, IE no tach signal. From what I gather from various sources, the PIP normally outputs a square wave waveform. At rest, it is a +12V signal, and with a drop to +5V while cranking/running.

What I am seeing is an output of +5.6V at rest, that drops to 2.2V with trigger wheel rotation. I get no RPM signal from 0-1500 RPM (max rpm of dummy motor), both on the MS2v3.0 and Microsquirt v3.0 I have been playing with. I have 2 modules laying around - the first seems to function OK, good spark output. The second does not seem to work at all. They are both from the junkyard.

The settings are as follows:
Trigger offset = 0
Ignition Input Capture - Rising Edge
Cranking Trigger - Calculated
Coil Charging Scheme - EDIS
Spark Output - Going High, inverted
Trigger Wheel Teeth - 0

I have the correct jumpers installed in the MS2, and the correct input connections on the Microsquirt (pin 12 + 30)
Both MS units run fine on the stim.
Also, all of the other sensor inputs (TPS, MAP, IAT, CLT) work 100% on the bench
VR sensor is correct polarity - as proven by #1 module outputting spark
Both EDIS and MS are receiving direct 12V power from battery, and grounds are good
One thing - I did not shield the PIP/SAW wires on the bench, but it should still pick up RPM signal even if poor quality?

I never want to be one to jump to conclusions, but I do indeed think that I actually have some bad EDIS modules. If anyone has some troubleshooting tips for diagnosing a bad EDIS module, that would be super helpful!

[trakkies]

I take it the voltages you're measuring are DC? What do you see if you change the DVM to AC?

[mic2377]

Yes, the voltages are DC. My understanding was that when not running, the PIP signal is not pulsed and it should read a constant DC voltage until it gets a signal from the VR sensor and starts to generate a square waveform. Hence why the reading drops to 5 V when measuring during cranking - it is then a pulsed (averaged) output that is being measured.

Regardless - I have 2 more modules, and will be attempting to run them as well tomorrow. I will measure AC and DC voltages from PIP.

Thanks for your input! If I get 4 bad modules in a row that may be a new record for the worst junkyard finds ever!

[trakkies]

My guess is you'd be very unlucky to find an EDIS unit which produces a spark - but no PIP. It's most usually the power devices which fail first in anything.

[mic2377]

Well, the results of testing are in. I did indeed have one bad EDIS module - it seemed to be completely non-functional both for spark and PIP output. However, the 2 other modules I have are functional. Both of the functional modules had the same PIP output at rest and cranking as was noted before ~5.6V at rest, 2.2V cranking, measured DC.

It turns out that the culprit for why I was not receiving an RPM signal was one of the defaults under the "dual/multispark options" ignition menu. It was set to "falling cam sync with tach or wheel." After resetting to "no dual or multispark," it picks up a stable RPM signal from 250 - 1500 RPM on the bench.

Also, I did some other experimentation while I was at it - the EDIS module seems capable of driving several different coils besides the stock one without issue, as long as the coil resistance is similar (~1.9-2.0 ohms). I tried out coil packs from a Neon and late model Focus in addition to the stock EDIS coil packs. The reason for this is that the stock coil packs have a rather inconvenient connector, versus the Neon packs which have a standard terminal post.

Thank you for all of your input, and I hope that this helps someone in the future.

[hemilove]

How did you wire your edis in your ms2 ecu? Do you have pictures to show your board due to the fact that I am going through something similar.


Thank you
Carlos Lopez