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Author Topic: Help with Tacoma transmission temp
psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 6, 2012 (GMT)

It was in a parking garage here in sunny San Diego – according to the temp display next to the compass it was about 75 degrees F in there at the time. Not exactly winter down here

piemmm
Posts: 6628
 Re: Help with Tacoma transmission tempon: January 6, 2012 (GMT)

I’m not 100% certain, but the PID you have may not be valid for the tacoma – the results of the test don’t match up with the maths (square peg, round hole type of situation)

Could someone try this:

PID: 2182
Equation: A-40
Units: C

and/or:

PID: 2182
Equation: C-40
Units: C

Posting the output from ‘Test’ would also be useful!
(going to get some sleep now so won’t be online for a couple of hours)

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 6, 2012 (GMT)

I’ll give them a shot later this afternoon and post back the results!

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 7, 2012 (GMT)

It’s a no-go on the 2182 pid. No response engine off or on.

LGE RAW
Member
Posts: 11
 Re: Help with Tacoma transmission tempon: January 7, 2012 (GMT)

FYI

With ambient temp at 76 degF after several hours my truck had cooled to 109.4 degF ECT.

Started the engine and hit test with the following output:

0: 61D9150000000
1: 4EC05460000000

I tinkered with the equation a bit and got a decent output at idle in park, but when in drive, the output doubled. One thing i did notice at idle in park. the value would change from 167.3 to 179.2 every few seconds like it was swapping between the two TFT sensors.

piemmm
Posts: 6628
 Re: Help with Tacoma transmission tempon: January 7, 2012 (GMT)

Hi

Had a fresh look at this after some sleep, here is the new equation as far as I can see:

(((((E*256)+F) * (7/100) – 400)/10) – 32) * (5/9) – for output in C

((((E*256)+F) * (7/100) – 400)/10) – for output in F

There is a small bug in C / F conversion which means conversion will not happen unless you have the ‘degrees’ character in front of it. This will be fixed in the next update due out this weekend.

Does the tacoma have 2 temperature sensors on it’s transmission?

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 7, 2012 (GMT)

Quote from admin on January 7, 2012

Does the tacoma have 2 temperature sensors on it’s transmission?

Yep, it does.

I’ll test out these equations shortly!

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 7, 2012 (GMT)

Ok, just ran some tests and I think you’ve nailed it.

I went out to my garage this morning, and connected without starting the engine. The temp gauge on the headliner said 65degF. Sent:

PID: 21D9
Result: 64.16
Response: 00A
0:61D900000000
1:3A203AC0000000

And at that point coolant temp read 64.4 deg F

Then I started the engine and headed out to my first errand of the day, the DMV. I took surface streets, travelling about 3.5 miles in 12the minutes. During that time, the transmission temp reading rose to 117.9 while the coolant temp rose to 186.8 degF and the ambient temp outdoors dropped to 59 deg F. When I parked, I left the engine on and got the following from the test command:

0:61D90E000000
1:58205AA0000000

I’ll keep an eye on it once I get out of here and head to next destination.

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 7, 2012 (GMT)

Just did another short trip of stop and go between red lights. Tyranny temp rose to 130.4 while coolant hovered at 188.2.

Will try a highway run in a bit.

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

Highway numbers looked good, too. Once I got up to speed it hovered around 124 or so. Would rise up towards 140 on surface streets and go back to the 120’s when cruising again.

LGE RAW
Member
Posts: 11
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

Man I’m glad to see this progress! Had to take a road trip early in the am and didn’t get to take any data. I’ll try to confirm these findings this coming morning.

LGE RAW
Member
Posts: 11
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

Sorry bout that, didn’t know.

{ed: please avoid posting things from other companies like this – it puts the app at risk, thanks!}

{ed: No real problem – dont want to tread on other people’s toes :)}

piemmm
Posts: 6628
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

Looking at the test results from the ECU, it seems the sensor is also already present after the first – change the equation variables from E/F to G/H to read the other transmission temperature sensor if that is what it is.

Or add another PID with the G/H equation in, then you can monitor both at the same time

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

I’ll add a second PID and watch them side-by-side today if I can. I suppose if the G/H reading is fairly consistently higher, it’s bound to be the “b” sensor right before the cooler intake. I’m surprised the service manual doesn’t actually say where the “a” sensor is… suppose I’ll have to read the teardown section closer to be sure.

LGE RAW
Member
Posts: 11
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

That seems to work brilliantly! I created another PID with a short name TFT 2 and it tracked equal at 121.3 to TFT 1 on Ignition only. When I started the engine, the two PIDs diverged to 114.6 and 126.9.

LGE RAW
Member
Posts: 11
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

One question. The long name on the original PID is now grayed out and can’t be edited. Do I have to create a new PID to correct the long name, or can it be unlocked?

Member
Posts: 3
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

I believe i found the location of the temperature sensors. They can be found here:

http://ncttora.com/fsm/05+/data/ileaf/06toyrm/06toypdf/06rmsrc/rm2006ta/02700.pdf

I have a 2010 Tacoma and i’ve found the temperatures using E/F to be off quite a bit.

For one, when the vehicle is off (ignition on of course), the temperature jumps up a few degrees when you depress the accelerator pedal. The temperature also jumps around as you drive or park and rev the engine anywhere between -36.0 to 383.4 F.

As for the G/H combination, I thought it was working last night when it was reading a consistent 134.4 F but I woke up this morning and it was still reading 134.4 F while the E/F read 66.5 F. The coolant temp is 74 F, so i’m pretty sure the 134.4 is off.

I’ve tried using A/B and C/D combinations with similar erroneous results.

psychohamster
Member
Posts: 16
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

Based on the scangauge codes posted here, it looks like the 2010+ models might need the 2182 PID instead of 21D9…

Member
Posts: 3
 Re: Help with Tacoma transmission tempon: January 8, 2012 (GMT)

Quote from psychohamster on January 8, 2012
Based on the scangauge codes posted here, it looks like the 2010+ models might need the 2182 PID instead of 21D9…

My 2010 results using the 2182 PID:

Sensor 1:

Result for equation: 0.0
Commmand: 2182
Response: 618248804880

Sensor 2:

Result for equation: 0.0
Commmand: 2182
Response: 618248804880

Doesn’t seem to be working on the 2010 with the 2182 PID.

piemmm