Why dont ye use a patch harness for ECU testing???
they are not cheap but saves messing around with your OEM wiring loom and are available for the 8 and 9,
all the pins are wired out for testing and makes it easier to add in things like switches and sensors???
just a thought as I said they are not cheap but very handy for any future testing,

here is the link in case ye are interested also if anybody needs wiring diagrams just ask I have all market diagrams for the 8 and JDM for the 9,

http://www.roadraceengineering.com/evo.htm

 

Here's the catch. Its $100+ for one of those harnesses where we can just add the additional wires we need for less than 5 bucks. AND...those harnesses probably are missing the actual wire locations we need. Don't forget, the pin locations we are testing don't have ANY wires on them in the stock harnesses.

 

yeah I understand the price is a killer,
but all the pin locations are wired I have one of the evo 8 ones use it for bench flashing of ecu's expensive but handy for testing,
anyway just thought Id share the link for anyone interested,

 

Thanks for the input Barry. In our situation, its just more cost effective to just do it the good ol' McGyver way,lol. Going to test my ECU right now, I'll post up my findings soon.

 

Ok, so I got nothing. MrFred, when you logged with evoscan, what were all the variables set to for your data list item settings? Maybe I have it set to different settings than you did. I used the MUT 83 for the 8929 and changed MUT 73 for 8928. I got nothing on either. Only one wire showed voltage too, +5V.

 

Its good that you saw +5V. At least we know that the wires were making contact with at least one of the pins.

For EvoScan, I had key "on", engine "off" with EvoScan set to show the log on screen. I was watching several of the ADC channels. ADC 0F is logged to MUT 83 on your ROM (and mine). MUT 83 should read 0 until you hit the correct pin with some volts. The value displayed in EvoScan will scale linearly with voltage with the max value being 255 at 5 V. I just went wire by wire until I saw ADC 0F change. Once I found it, then I checked the scaling using 1, 2, and then 3 AA batteries in series.

Its not a guarantee that ADC 0F is mapped to an unused pin with the Evo 8s, but it seems likely. My first suggestion would be to ball up the stripped wiring more so that you're sure its making contact with the pins. Also, can you post the entry in the EvoScan Data.xml file that you used to log MUT 83?

 

I tried each wire at 0.5 volts thru a 10K ohm resistor, then i tried them directly connected to the AA battery like you originally did and got nothing on evoscan. I logged on evoscan the same way you did. I changed one request ID to "17" which is TPS and it read 34 while at rest and increased when the pedal was pressed so I know the code works, just the request ID's didn't seem to be with the wires I was checking.

I guess I'll have to be more certain the wires are making a connection and try again, unless you see something screwy with my evoscan xml stuff. Post up yours and I'll just copy it to my XML file.

 

Just tried it again, wires 'seem' to be in just fine. Still reading '0' for both MUT locations.

 

Here is my EvoScan entry:

<DataListItem DataLog="N" Color="" Display="ADC_0F" LogReference="ADC_0F" RequestID="83" Eval="x" Unit="int" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="0" GaugeMax="255" ChartMin="0" ChartMax="255" ScalingFactor="1" Notes="" />

 

when you apply the voltage where are your grounding the "other end" to?

 

I grounded it the sheet metal that the ECU mounts on. JofT did see 5 V on one pin, so it seems like he was grounding ok.

 

My methanol flow sensor (Labontemotorsports) has a 0 - 5vdc output proprtional to methanol flow (0 - 2000 ml/min).

How easy would it be to patch that into the ecu and log my methanol flow on LogWorks!

That would be very cool I think. If not cool at least very useful

 

Very easy if there is an unused ADC input on Evo 8s.

 

I grounded mine at the cigarette lighter terminal. Like Fred said, my ground source was fine since I read 5V on one of the wires.

Are you certain the MUT codes are the right ones for my ROM?????

 

This is annoying. The EVO8's pin profile is rectangular.