I know this subject has come up before, but I'm having trouble finding it using the search function.
A while back there was some discussion abt how to easily get the wideband data into the datastream.
From what I've been hearing, the MAT sensor is not really used for mixture control on a MAF car. Is it possible to connect my DIYWB-02 signal to the ecm thru the MAT connection??
If not, is there another easy way to do it?

I'm running a 165 ecm.

 

This should get you started.

https://www.thirdgen.org/techbb2/sho...hreadid=105227

There is a link in that thread that has some ready to run stock .BIN's with the wbo2 stuff hacked into it and info on how it works.

Hint: it was the first hit when i searched for the following terms:

'165 wbo2 aldl

 

That's exactly what I was look for! Thx!

When I built the DIY WB-02, seems like the vout was 0 - 4v max using the ground supplied by the DIY WB-02 box, and 4-8v using the vehicle's chassis ground. Need to go check that.

Anyone had any issues connecting the vout of the DIY WB-02 kit directly to the TPS2 pin?

 

yikes, that's definately some kind of grounding issue.

I run a single wire output from my DIY WBO2 into my '730 with no problem and it reads correctly.

 

When hooking up the DIY-WB to another device such as an ECM, the power and grounding is important. Here is the best method:

Vehicle power (B+, ignition switched) to J3 (heater) and J11 (UEGO controller power). A 14 AWG wire is OK.

Vehicle ground, heavy to J4 (heater). This should be a 14 AWG wire to a solid chassis ground. A ground under the dash is OK.

Now for the UEGO ground and Vout:

Wire J12 (UEGO ground) to an ECM ground. Can tap into the harness close to the ECM or ground it to the ECM case.

Then wire Vout (J8) to TPS2 on the ECM.

What is being done is running the heavy power for the heater to chassis power and ground. The UEGO power can come from the same source.

Then the UEGO controller ground reference (J12) is tied to the ECM ground (a reference for the ECM ADC). The DIY-WB was designed with this in mind. When the DIY-WB is setup such as described, do NOT connect J4 and J12 together. They need to be grounded separately.

RBob.

 

I downloaded the arap/wb02 bin and copied all the other parameters from my current bin. Connected the Vout to pin D8, and walaa!! It works! Cool!!

I still had my voltmeter connected to the Vout and noticed when the ecm was connected, my 2.5volts dropped to 2.42v.
When the key was turned to "run", the voltage was 2.46v.
Is this normal for the ecm to pull down the Vout voltage??

At idle, the Moates datalogging s/w shows the mixture at 15.3-1 while the wb02 is showing 2.45v.

At WOT the voltmeter shows 2.00v (12.17-1) while the Moates s/w shows 12.5-1...

Tried grounding the wb02 (via J-12) to the ecm case, but the voltage drop issue didn't change at all.

I connected another voltmeter and it indicates within .01v of the primary voltmeter, so I think I can rule out the meter.

Is there a way to offset the AFR indication seen on the laptop to match my voltmeter??

 

The issue of the Vout being pulled down when connected to the ECM is because of the 51K pull down resistor in the ECM (MAP2 input on pin D8). Some of this can be alleviated by reducing the value of the 1K output resistor on the UEGO controller. Use a 100 ohm in it's place.

The issue of the Vout vs AFR and AFR reported by the ECM can be caused by either a grounding problem and/or the table lookup.

RBob.

 

Thx for the advice RBob!

I spoke to a friend who happens to be a pretty sharp EE.
Here's his reply:

""The combination of the 51K input resistor and 1K output resistor will drop the voltage to 98.07% of the open circuit voltage. Going to 100 ohm would put you at 99.8% of the open circuit voltage.

The resistor is there to help protect the op-amp from grounding. The op-amp itself should have over current protection built into it's output, but the resistor helps to not exceed the maximum rating for good measure. The resistor also helps isolate the two circuits from one another.

The LM324 op am can supply 10-20mA of current depending on if it issourcing or sinking current. The 100 ohm resistor would limit the current from a 4 volt source to 40mA which exceeds the spec. But chances are it would work fine since you probably won't ever ground it. A 400 ohm resistor would put you at 99.2% and keep you in the 10mA safe zone.

I would be tempted to put a 470 or 330 ohm resistor in there just to get into the 99 percentile range.""


Think I will go with the 100 resistor so my voltmeter will read right.

Does anyone know where I can find an ECU file for this $6e arap bin with WB02 capability??
http://www.eecis.udel.edu/~davis/z28/WB_hacs/

I'm using GMECM Edit V2.06b..

I was wanting to tweak the lookup table that converts WB02 vout voltage to AFR.

Thx!

 

I wondered about the affects of the RC filter in the ECM. I guess it all depends on the look-up table and how it translates the values.
I wonder what the Mike Davis' code is set up for in terms of the front-end.

J

 

Any updates on the ECU file I was looking for that would allow DIY-WB vout VS Displayed AFR lookup-table editing??

 

Yikes and holy cow, man! Get the latest version.

http://tunerpro.markmansur.com/

 

Well I got the ol' 383 up and running again.
I'm using the special ARAP bin file modified to display my WB-02 data in the datastream, but I still need to tweak the displayed AFR so it matches what my voltmeter says is the true AFR.
Anyone know where I can get an ECU file that will allow for that??

Thx!!

 

I wired TE 2J1 to TPS2 input. When I made connection voltage in WBlin output of 2J1 dropped from 4.98V to 1.89V (engine wasn't running). Have anyone else had this kind of problem? According schematics TPS2 input has 220k resistor to ground and 10k series resistor...

 

Well first thing, make sure you're really hooked to TPS2.

second, you could try hooking a low-current source ability voltage to the TPS2 (say, a pair of 2.2k resistors in series between +5 and ground, and use the 2.5v in the middle to feed TPS2). If the ECM drags this value down as well, then for some reason the ECM is grounding TPS2.

 

I think that I found problem; TE 2J1's WBlin output may be broken. I wrote to TE and they asked me to test output with 4k7 resistor.
When I put 4k7 resistor between WBlin+ and WBlin- voltmeter showed only 0.11V while display showed AFR 13.2. Voltage should be 2.1V with that AFR.

 

More problems; I connected potentiometer to TPS2 and +5V/ground but nothing happened when I was changing value. So I opened ECM and checked TPS2 signal route to U6. Signal was as it is in http://www.cruzers.com/~ludis/1227749schematic.html.

BUT when I checked multiplexer control signals I found that they wasn't where they supposed to be, uC pin 11 to MUX A pin 11. What??? Controller wasn't the same 16034980 as in that schematic than 16139860. Can that be problem? I checked some other signals and for instance crystal is also in other pins. So controllers can't be pin compatible. I couldn't found any schematic that was using that 16139860 controller.

When I started engine for the first time after installing WBO2 patch engine didn't run well (AFR in idle 25) so that patch don't work with that uC. It might be possible that Super_AUJP worked because there wasn't any modifications directly to I/O pins or was there?

 

what ECM are you using?

 

1227730 reads on the top of ECM. I tryed to find markings from PCB that proves it to be 730 but I didn't found.

Dam.. I have calculated it wrong. I was desiging project that uses driver in PLCC44-case. Pin counting starts at the middle of top edge so I have to re-check it later.


But I'm still wondering why I couldn't get any reading change in IAC Min value in ALDL data when I connected potentiometer in TPS2 (or MAP2).
And why patch mixed VE tables?

 

I have a 1227165 ECM (mass air flow) hooked up to a wbo2 through the tps2 pin. PM me if you need help. I've been doing a lot of dyno tuning lately with it.

 

Your ECM have little diffrent electronics inside. It's nice if you have succeed to patch your bin for 1227165 but as I mentioned patch for 1227730 don't work as it should and I don't know what I have done wrong.

 

What Patch file & Bin?

 

8D_WB.zip, S19_pat.exe AUJPWB.S19 SAUJP.bin (with my changes to VE and spark tables).
I also found some bins in subfolder of that zip but I patched my own bin so I didn't have to make changes to tables again. Perhaps I should try to modify tables of ready pached bins (for exable S_AUJPCCPv2wb.bin that exist on that subfolder)