Scangauge X-Gauge Codes for Jul 21+ Models

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

RPP if you don't want to work through the list can you plug in this code and tell me what you get back from both RXD values, as that will confirm what Combination Meter ECU codes are active in the 2121-2140 block.

TXD: 07C02120
RXF: 046115200000
RXD: 2810 / 3810 (get value from 2810 first then adjust to 3810 and get new value output from each will be a 4 digit HEX code).
MTH: 000100010000
Name: TST

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

GeeWhizz, As a suggestion maybe try getting an alternate scantool connected and go for a drive to see if the issue is in the vehicle (i.e. still not showing a TC lockup at operating temps).

The other items you can monitor that may give more info is RPM vs Trans Input Shaft Speed (221601 which is 8 bit and changes in 50 RPM increments e/g A*50).
The trans solenoid state changes must be somewhere in 221631 (15 Bytes) but I haven't decoded what is where in it.

[RPP Senior Member Find all posts View Profile Close RPP]

RPP try running through the other options mentioned in the Edit as pretty sure it will be one of them (try 2B, 2D,2E, 2F first and then backwards from 28 to 21 if no luck).
Edit: don't be concerned if the number is out as it may need a MTH tweek to get right scaling but first need to workout which one responds in that block so let me know what you get back.

TY ptommo59.
I'll do some R&D in a few weeks. Currently installing the usual attachements, plus radio and power hungry stuff - driving lights and ARB's new brushless twin compressor into the 76. The compressor needs 90+ amps!, and the air hose&small inbuilt airtank gets hot (>>60C). My priority is cabling and designing some exotic heat management measures to avoid the various plastic trim and carpet from melting.
Standby.

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

RPP, For heat management try covering the hose in one or two layers of heat resistant sleeve in the problematic areas (the same as used on diesel heater exhaust) which is not that expensive to purchase on EBay. The link has an example its 30mm dia and fits over 24mm exhaust pipe. https://www.ebay.com.au/itm/136274419021

[RPP Senior Member Find all posts View Profile Close RPP]

RPP, For heat management try covering the hose in one or two layers of heat resistant sleeve in the problematic areas (the same as used on diesel heater exhaust) which is not that expensive to purchase on EBay. The link has an example its 30mm dia and fits over 24mm exhaust pipe. https://www.ebay.com.au/itm/136274419021

Ty ptommo59.
I used fibre-glass exhaust wrap on the non-brushless compressor's hose in my Prado, plus reflective sheilding (sizalation type) between the polypropylene trim and compressor. Polyproylene could've handled the heat - more or less. The fibre-glass wrap was godawful stuff to handle tho'.

I've got more heat to deal with in the 76 so have resorted to a PTFE sheet between the floor carpet/PP trim and brushless compressor, and titanium (lava wrap) exhaust header wrap around the hose. That basalt-fibre based wrap is easier on the hands and lungs.

[GeeWhizz Senior Member Find all posts View Profile Close GeeWhizz]

ptommo59

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ptommo59 Thanks for the many suggestions. It's been a steep learning curve adjusting my expectations to the later model (2023) Prado. While the gearbox is technically identical to my old 2016 GX, getting the expected results with the revised ECM has required different testing tactics.

Prior to today, I'd been logging detailed "debugging"-type data on a local highway with an 80kmh speed limit. The torque converter doesn't seem to want to lock until the vehicle is driven consistantly over 70kmh - something that was difficult to achieve due to the traffic levels.

For today's test, I took the Prado (without the caravan) for a run up and down the Mitchell Freeway (100kmh limit). With today's test, I managed to record several TC lockups which only occurred with consistant speeds over 70kmh and these lockups only occurred when the ATF pan temperature rose above 77C.

Now an admission: the TC lockup in the 2016 Prado OBD data was indicated with bit 7 or the appropriate byte. TC lockup in the 2023's UDS format is indicated with bit 0, and I hadn't noticed this change. I'm planning another trip with the caravan in the coming days, so will see what the "black box" data recorder says about the corrected output.

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

GeeWhizz, That makes sense now if you were limiting to monitoring only bit 7 you would see nothing change.

My 21 VX when not towing locks in 3rd gear as low as 50 km/h and 4th at 60 km/h when the engine and trans are up to operating temp (normally under slight acceleration) so seems odd that yours is performing so different. There is an Adaptive Learn Function in the ECM that does some tinkering with engine and trans behavior so I wonder if yours has either a different Factory Calibration loaded or the previous owners driving style/usage has caused the learn to skew to where yours is vs mine. Might be interesting to have the Dealer check you have the latest Calibration loaded and reset the learn so you can redo to match your usage.

EDit: One thing to note is once reset it will be like driving a brand new vehicle so shifts may be a bit harsher until the engine and gearbox get used to each others behaviour and tweek timing/pressures/torque cut etc to get smoother/better shift control.

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

GeeWhizz, out of interest may be worth seeing what the ATF Thermal degradation figure looks like on yours as may tell you if the previous owner was stressing the trans at any stage.

Should be able to access with 22162B should be 16 bit value with no scaling (>49999 is ATF cooked)

As an indicator my 21VX with Trans Cooler fitted is sitting at low 600s at 65,000 km (30,000 km of that towing a caravan between 2.5 &. 3.0T with a couple of trips over the Great Dividing Range at Mt Hotham/Omeo)

[GeeWhizz Senior Member Find all posts View Profile Close GeeWhizz]

Thanks for the tip on ATF degradation - I'll check the code. It might take me a week or two to check it out - our son is getting married this weekend and we have family arriving from all over Oz.

It's hard to know if the Prado had a hard life prior to my purchasing it. The vehicle didn't look as if it had been misused. It came with a (genuine) tow hitch that looked new. On the other hand, you may remember the saga of the front diff that I reported a few months ago - although I don't know how you can damage a front diff.

[RPP Senior Member Find all posts View Profile Close RPP]

Thanks for the tip on ATF degradation - I'll check the code. It might take me a week or two to check it out - our son is getting married this weekend and we have family arriving from all over Oz.

It's hard to know if the Prado had a hard life prior to my purchasing it. The vehicle didn't look as if it had been misused. It came with a (genuine) tow hitch that looked new. On the other hand, you may remember the saga of the front diff that I reported a few months ago - although I don't know how you can damage a front diff.

Did you buy a second hand early model 1GD 2.8l? They struggle to hold lock in 5th & 6th under load.

If the previous owner didnt monitor the ATF temp then it's likely that the ATF has been boiled a few times (without the owner knowing).

My 2018 GXL's ATF temps got >125C until I learnt to drive it like a manual, and I don't tow
I doubled the ATF maintenance as per Toyota's Additional Maintenance schedule. Even so, after each ATF replacement the technician reported the condition of the fluid as burnt. So I plan to replace the ATF at 50-60K intervals.

[GeeWhizz Senior Member Find all posts View Profile Close GeeWhizz]

RPP

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RPP As mentioned previously, this is my second Prado 150. Apart from the DPF issues with the January 2017 delivered GX, I was so happy with it that I upgraded to a 2023 GXL last November, so definately not an "early model". The tow hitch showed no sign of being used when I did my pre-purchase check, so I don't think it has been overloaded. I posted a chart of the ATF temperature logged towing a 2.5T caravan in post #25 of this thread - I doubt that the ATF has "boiled". I'll check the ATF temperature degradation index after the coming weekend and report back.

[RPP Senior Member Find all posts View Profile Close RPP]

RPP try running through the other options mentioned in the Edit as pretty sure it will be one of them (try 2B, 2D,2E, 2F first and then backwards from 28 to 21 if no luck).
Edit: don't be concerned if the number is out as it may need a MTH tweek to get right scaling but first need to workout which one responds in that block so let me know what you get back.

Hi ptommo59.

I tried all those TXD variations. No Data is all I get from Scangauge.
I'll try your next suggestion soon. Standby.

I entered a tst xgauge, linked it to a displayed gauge, then stepped thru each variant by modifying the TXD in the tst xgauge and checking the display.
I didnt delete each gauge and re-enter the next as a new one.

[ptommo59 Senior Member Find all posts View Profile Close ptommo59]

Hi RPP, if you only changed the TXD it won't work you need to change the TXD and RXF at same time so they match.

Yes it may be easier if you try the TXD: 07C02120 code variations in other post as it should tell me which is the one we are after if you get the two sets of HEX values..

[RPP Senior Member Find all posts View Profile Close RPP]

Hi RPP, if you only changed the TXD it won't work you need to change the TXD and RXF at same time so they match.

Yes it may be easier if you try the TXD: 07C02120 code variations in other post as it should tell me which is the one we are after if you get the two sets of HEX values..

Of course.
Back to the shed shortly. Standby.

[GeeWhizz Senior Member Find all posts View Profile Close GeeWhizz]

@ptommo59: I added the command you suggested for monitoring the ATF Thermal degradation, which is only run immediately after the engine is started. It suggests that the transmission fluid is in pretty good shape. I'll see how things go next weekend whem we go away with the caravan again. It will be the first time that I'll have the CAN monitor running and recording for the whole trip.

00:01.594,Ign = On
00:01.594,TxU4@115200:'ATSH700<CR>', Cmd=213
00:01.595,TxU4@115200:'22162B<CR>', Cmd=233
00:01.605,One Line Resp,708 05 62 16 2B 04 01
00:01.606,Gearbox: ATF Degradation
00:01.606,0x62162B,233,ATF Condition=,1025