Isuzu OBD2 Extended PIDs

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Isuzu OBD2 Extended PIDs

Postby ZooNoob » Thu Jul 02, 2015 3:28 pm

I did a bit of searching and sifting but I haven't found too much info that doesn't involve getting a $2.5k membership to. I've downloaded the Torque Pro app for android and I've been messing around with it for two weeks now. I've noticed that a lot of sensors are not available, like engine oil temp. The coolant temp worked right out of the box and a scan of the ECM got the Trans temp working, so I would believe that the oil temp would be available right?

Anywho, I can't be the only one who has dl the app and played with it. So before I go scanning, opening a door, scan again until my eyes bleed does anyone have a list of the extended PIDs or a faster method to getting them? Thanks.
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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Thu Jul 02, 2015 5:21 pm

ZooNoob wrote: The coolant temp worked right out of the box and a scan of the ECM got the Trans temp working, so I would believe that the oil temp would be available right?


Wrong, a 2001 Rodeo does not have an oil temperature sensor installed. The engine does have a coolant temperature sensor installed and the 4L30e AT has an ATF temperature sensor installed.
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Re: Isuzu OBD2 Extended PIDs

Postby ZooNoob » Thu Jul 02, 2015 5:49 pm

Well, that sucks; looks like another possible project added to the maybes pile. So about those PIDs
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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Thu Jul 02, 2015 7:25 pm

A 2001 Rodeo does not monitor a lot of OBDII parameters, just very basic mode 1 engine stuff.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Sun Sep 20, 2015 4:10 pm

I would love to know how to access some of the additional info as well - specifically the transmission temp for our 2002 Trooper. I know it's in there, the Isuzu scan tool can get to it...just a matter of knowing the correct address and multiplier...

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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Mon Sep 21, 2015 3:59 am

Check this link: viewtopic.php?t=43200
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Mon Sep 21, 2015 6:19 pm

Probably should have been a little more specific. I've got one of the cheap bluetooth OBD2 units and running the Torque Android app. Works great, but even adding in the GM PIDs doesn't get it to read the transmission temp.
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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Tue Sep 22, 2015 5:44 am

Since the ScanGauge tool can only read 00-02 Trooper transmission temp using the Allison transmission PID as opposed to other GM transmissions it probable your tool is sending an incorrect TXD formatted message
Click on image to expand.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Tue Sep 22, 2015 8:04 am

That certainly looks like the right info...or at least headed the right direction. Problem is the Torque app appears to have it all in a different format. When I add the GM predefined PIDs, then look at the details on the transmission temp, it shows:

OBD2 PID = 221940
Minimum Value = 0
Maximum Value = 200
Scale Factor = x1
Unit Type (degree/infinity type symbol) F
Equation = ((A-40)*1.8)+32
**Edit - the board apparently substitutes number 8 and right parenthesis for a smiley face - the above is ((A-40)* 1.eight)+32

Of course both of the transmission types listed in your table end in 221940. Are you thinking the correct one is the 2nd one that says Allison, even though it lists it as a 5-speed?

Perhaps I should investigate other OBD apps and see if one of them works better...

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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Tue Sep 22, 2015 9:32 am

The first 3 bytes in the header are Priority, ECU Address and Scan Tool Address. The second byte in the header is different for the Allison but this selection has been reported to provide Trooper 4L30e ATF temp when using ScanGauge. Additionally, I read $22 as mode 22 which means get data by PID and $1940 as the PID number.
Last edited by Buster28 on Sun Sep 27, 2015 4:46 pm, edited 1 time in total.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Tue Sep 22, 2015 9:25 pm

Sounds like I need a better program to accomplish this. I tried a few others today, but no dice. I may even try a few windows programs. Anyone have any recommendations? Or know a program on any platform that will read the transmission temperature data? I could certainly get a scangauge, but I can't justify the price...

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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Wed Sep 23, 2015 10:32 am

The TDX command to retrieve the mode 22 transmission temp PID uses a standard OBDII J1850VPW message structure, the problem is your tool and others are apparently using the wrong address to retrieve the transmission temp. The correct OBDII TDX witch chant is apparently is 6C 18 F1 22 19 40. Your tool should work if you can get it to send the correct request. The 2nd byte is 10 for GM engine controller physical address and 18 for transmission controller physical address. The numbers are in Hex.

The (A-40) is the offset to retrieve the transmission temp in celsius from the response. The multiply by 1.8 and add 32 converts C to F. Example: Water boils at 100C so 100C x 1.8 = 180 + 32 = 212F.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Sun Jan 31, 2016 7:09 pm

OK...resurrecting this old thread once more...I think I may have finally been able to get the data out of the computer. It's not pretty, and it's very manual...but once I test it a bit more to be comfy this is really the right data, I'll see if I can create an Arduino or Raspberry Pi device to provide a display of the data.

I am using an ELM327 bluetooth adapter - one of the cheap ones you can get via ebay and such. I took a Windows computer and paired it to the adapter (use pin 1234 if you're trying to set up one of those things for the first time). At that point, I used PuTTY (a terminal program) to communicate with it on COM4 (device manager showed COM3 and COM4 as bluetooth devices - 3 didn't work, 4 did). Based on a few web sites, I gave it the following commands:

atz (reset)
atl1 (turn line feeds on)
ath1 (turn headers on)
ats1 (turn spaces on)
atsp0 (set protocol to auto)
atsh6c10f1 (set header/prefix as noted above - apparently 10 is the ECU we want, not 18, couldn't get data out of 18)
22194001 (retrieves data for mode 22 PID 1940, and 01 for whatever reason, but that seems to get data as noted in the Scangauge notes)

This returns a line that says:

6C F1 10 62 19 40 50 32

Going by the chart in the post above, or here - http://www.scangauge.com/support/x-gauge/gm-specific/ - and using this as a decoding guide - http://www.scangauge.com/wp-content/upl ... Coding.pdf

RXF is the receive filter...using the provided number and the notes to decode it, that matches up properly with the first 4 sets (bytes) of data. 19 40 is the PID. The RXD of 3008 as noted is telling us that the byte of data that follows 19 40, in this example 50, is the data we are looking for...not sure what the 32 at the end is all about, but it does seem to change. From what I've read elsewhere, the formula such as found above, ((A-40)* 1.eight)+32 (eight changed from an 8 to prevent a smiley face from showing up), you first convert the data from a hex value of 50 to decimal, which is 80. Open Windows Calculator, go to View, Programmer Mode, click hex, type in 50, then click dec and you'll have the decimal value - then don't forget to change it back to standard for following calculations. So...80-40=40 degrees Celsius. *1.8+32=104 degrees Fahrenheit. This was after a trip and it had been sitting for a while. Been 4-5 hours now and I pulled the data again and got 41, which converts to 77 degrees. Certainly seems a plausible temperature on a 50 couple degree day. I'll check it in the morning after it has sat all night and see how it compares to ambient temperature.

Does that sound right to everyone else? Or have I gotten something totally wrong in there?

Thanks,

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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Tue Feb 02, 2016 7:15 am

Seems like the issue to resolve is why the Torque Android app can’t properly query Mode $22 PID $1940 and you can by using a terminal program. It is also curious you can't get the temp using the transmission address of $18 but the ScanGauge tool can.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Tue Feb 02, 2016 8:25 am

I've wondered the same thing about Torque. The mode and PID are the same, and there's a long list of mode 22 PID's, though I haven't tried any of the others yet. Unless it is trying address 18 and it needs to be 10? My guess is that prefix that I'm using isn't being set, or isn't being set the same by Torque,and there's no provision to provide that bit of information to Torque.

But as you say, why does the Scangauge work and my manual commands at that same address don't? Could there have been any changes to the Trooper such that maybe 98-99's are at address 18, and 2000-02 are at 10? Guessing at year ranges here for purposes of an example...

I ran it on the seat beside of me on the way to work yesterday. Starting out cold, probably 40 degrees overnight, it registered 44.6 degrees. I only drive 2 miles to work, it got up to 96.8 by the time I stopped it...assuming I have it all right, but it looks like it. I have to drive to town this evening, so we'll see what it gets up to on a longer drive.

Thanks,

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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Tue Feb 02, 2016 9:25 am

wesf wrote:But as you say, why does the Scangauge work and my manual commands at that same address don't? Could there have been any changes to the Trooper such that maybe 98-99's are at address 18, and 2000-02 are at 10? Guessing at year ranges here for purposes of an example...


The engine and transmission control functions of 98-02 Trooper are controlled by a single electronic module called the Powertrain Control Module (PCM). However, the 98-99 PCM is different from a 00-02 PCM in that the 00-02 engine has an Ion Sensing ignition and an Electronic Throttle Control system with electronic Cruise Control. Additionally, the 00-02 uses PWM controlled Torque Converter Clutch (TCC) so the transmissions are different. So it could be address $18 is 98-99 and $10 is 00-02

PID $1970 is PWM duty cycle, so you may want to query it. The duty cycle is in % and changes as the PCM controls the TCC in 3rd and 4th gear.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Wed May 11, 2016 10:38 pm

Another update...

In order to put in the header to get to the desired data, you have to have the full version paid Torque Pro. The Lite version does not have the blanks to allow you to put in the header to talk to the right ECU/PCM/Address/Whatever. So...get Torque Pro, then add the custom GM PIDs and edit the Transmission Temp one to have an OBD header of 6c10f1 and it will read it for you.

What I hope to do next, as time allows, is create an Arduino setup to read the temp (and maybe other info) via bluetooth, then mount it and an LCD readout inside the little cubbyhole to the left of the steering wheel beside the blinking security LED. We'll see how it works out...I'll post all the details when I get done if anyone is interested.

All that said...it reads transmission temp just fine. I can also get the gear and TCC Slip RPM, but I can't seem to get it to read PWM Duty Cycle...probably should try it with a terminal again and see if I can get something there first. What should be considered normal under what circumstances on the TCC Slip RPM? And how about PWN Duty Cycle if I can get it to read that?

I'm heading out in the morning, towing our 21ft travel trailer 175 miles down the road, including a good stretch of quite hilly 55mph running...will be interesting to see how the temperatures react. So far, I've not seen anything over about 165...usual is more like 135-145 on the highway...gets warmer going slow in traffic in town. That is with an aux trans cooler on it...

Thanks,

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Re: Isuzu OBD2 Extended PIDs

Postby Buster28 » Fri May 13, 2016 8:54 am

wesf wrote:All that said...it reads transmission temp just fine. I can also get the gear and TCC Slip RPM, but I can't seem to get it to read PWM Duty Cycle...probably should try it with a terminal again and see if I can get something there first. What should be considered normal under what circumstances on the TCC Slip RPM? And how about PWN Duty Cycle if I can get it to read that?
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The Torque Converter Clutch Solenoid (TCCS) control signal used in 00-02 Trooper (and 02-03 Axiom) is Pulse Width Modulated (PWM). The 12 Vdc 32 Hz PWM signal is switched On and Off by the PCM, the duration of the On signal is the duty cycle. For example, 1/32 Hz = 31.25 milliseconds (ms), if the 12 Vdc signal is on for 15.625 ms and Off for 15.625 ms the duty cycle would be 50%. The TCCS is acting a hydraulic flow control device that controls the hydraulic fluid used to apply the Torque Converter Clutch (TCC). In the older Trooper transmissions the TCCS was either On or Off and the TCC was applied or not. The PWM TCCS applies the TCC gradually to reduce mechanical stress on the transmission. When the TCC is fully applied (90% TCCS duty cycle) TCC slip should be very low. The TCC may be applied in 3rd or 4th gear and in some cases 2nd gear.The PCM monitors the engine rpm and the transmission output shaft speed sensor to determine the slip. I think normal slip would be 20-40 rpm.
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Sun May 15, 2016 8:17 pm

Buster28 wrote:The Torque Converter Clutch Solenoid (TCCS) control signal used in 00-02 Trooper (and 02-03 Axiom) is Pulse Width Modulated (PWM). The 12 Vdc 32 Hz PWM signal is switched On and Off by the PCM, the duration of the On signal is the duty cycle. For example, 1/32 Hz = 31.25 milliseconds (ms), if the 12 Vdc signal is on for 15.625 ms and Off for 15.625 ms the duty cycle would be 50%. The TCCS is acting a hydraulic flow control device that controls the hydraulic fluid used to apply the Torque Converter Clutch (TCC). In the older Trooper transmissions the TCCS was either On or Off and the TCC was applied or not. The PWM TCCS applies the TCC gradually to reduce mechanical stress on the transmission. When the TCC is fully applied (90% TCCS duty cycle) TCC slip should be very low. The TCC may be applied in 3rd or 4th gear and in some cases 2nd gear.The PCM monitors the engine rpm and the transmission output shaft speed sensor to determine the slip. I think normal slip would be 20-40 rpm.


Well...I apparently just hadn't driven enough to see how the PWM duty cycle reading reacted. With settings of PID 221970, minimum value 0, max 100, OBD Header set to "auto", I am getting data. Not sure exactly what it is meaning though...the data is reading either 0, or varying numbers typically from 120ish to 180ish...I can only guess as a %, it should just be a number 100 less than listed. I think I did see it briefly read something over 200 during a short time when it was engaged in 2nd gear...so perhaps it is not that simple.

Another interesting observation - I normally drive with "power drive" enabled, otherwise it doesn't seem to want to downshift unless you are really pushing it... I noticed that running in 3rd gear at light throttle and 35mph or so, it was not yet ready to engage the TCC...turned off power drive and it kicked right in.

As noted, I was towing a 3000# empty weight travel trailer, and I kept it limited to 3rd gear. Under heavy throttle at speed, the PWM duty cycle would increase and the TCC slip RPM would drop into the single digits, otherwise it did seem to roam in the 20-40 range.

Temperature wise, for the majority of it, it didn't seem to get any warmer than without the trailer attached. Typically 145-165 or so depending on the day, pretty steady, though the weather was fairly cool. One exception was pushing pretty hard up a long, steep grade from a stop at the bottom...it did get up to about 180 for a short time. Looks like (at least in cooler weather) that transmission temps are not anything to be concerned about on my Trooper with the aux transmission cooler installed...

Thanks,

Wesley
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Re: Isuzu OBD2 Extended PIDs

Postby gwana66 » Fri May 20, 2016 9:47 am

Maybe you're seeing binary values from 0-255?
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Re: Isuzu OBD2 Extended PIDs

Postby wesf » Fri Jun 03, 2016 7:50 am

Good thought...I'll have to observe some more and see...

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Re: Isuzu OBD2 Extended PIDs

Postby LukeA » Sat May 09, 2020 3:39 pm

I've been unable to get the transission temperature to work on Torque Pro - I'be interested in hearing how you did that?

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