Oil Pressure data

Has anyone been able to read the oil pressure using Scangauge or Ultra Gauge or other OBD 2 readers?

The oil pressure gauge has no numbers on it.

I assume if someone has a code for one of the above, they will all be very similar.

Unlike oil temperature, there is an oil pres. sensor and ECU can read it so maybe we can have a digital readout using one of the above.

 

Unfortunately, oil pressure is NOT a signal that is provided by OBD2. The manufacturers got together and decided what standard signals would be output to the OBD2 port. Some manufacturers add proprietary signals to certain terminals, and that's how Tundra owners are able to read ATF temperatures. If any given parameter is not output to OBD2 by the ECM, you can't read it with any of the scanners.

 

Do you know if techstream people can read oil pressure?

Also VERY surprised that Tundra doesn't have oil temperature sensor!!!!

 

I don't know if Techstream reads engine oil pressure. Since Techstream input is from the OBD2 port, my guess would be no. Further, if the Toyota SRM is diagnosing an oil pressure problem, it would probably bypass the sensor altogether and attach a pressure gauge directly to the engine.

I didn't say OBD2 does not have an engine oil temperature output. Engine oil temperature IS available from OBD2, but not all manufacturers support all the OBD2 parameters.

For all available OBD2 gauges, go to Appendix A, page 67 of this user manual:
http://ultra-gauge.com/blue/ultragauge-blue-user-manual.pdf

Toyota Tundra specific gauges available on Ultra-Guage are shown here:
http://ultra-gauge.com/blue/obdii-manufacturer-gauges.php

 

That is correct, you didn't say anything about oil temp sensor but i have been told by few people including some Toyota techs that Tundra doesn't have any oil temp sensor.

btw, curious what ultragauge is reading if there is no oil temp sensor.
my scangauge doesn't have any oil temp selection for Tundra because the car has none!
wonder what ultragauge is smoking … lol

 

I would think oil temp is very nearly the same as engine coolant on those engines with an engine oil cooler, no?

 

Not even close.
Question to all those wanting to know the values:
"If Toyota does only gives you high low cold hot gauges, OBD2 does not see it as important enough to have it, why do you guys want it? It does you, consumers, zero good to have actual values. In fact I will argue it only confuses consumers, even enthusiasts like yourselves."
I used to design and engineer mechanical and high pressure hydraulic systems for 20 years before I went to the business side. We quit using actual gauges because of the variability in systems and operating parameters. We gave them "go-no go" gauges and moved on. Can we, the engineers, get actual values? Sure and on some machines we get it in real time.
Values can be "normal" even though they are wildly different from one moment to the next depending on operator and conditions.

 

why doesn't Tundra put some psi numbers on the oil pressure gauge like the Voltage gauge? is the new Supra like Tundra?

did anyone figure out what psi is the center line on the oil pressure gauge?
if not, that's your homework for today. lol
does 2020 have psi numbers?

 

Toyota doesn't put numbers on the oil pressure gauge for the exact reason @1engineer quote said. (@1engineer might have made that quote up, but it sounds about right. ) They don't want the owner to know that idle oil pressure on their old 200K mile truck may only be 4-5 psi, when it is still running fine. If the owner brings it in with a concern, technicians may check it, and then they'll have to explain to the owner that "if it ain't broke, it don't need fixing". Or, alternately, offer him an engine rebuild or replacement for $$$$.

If forced to check for low oil pressure on an engine that's running fine, below are the "Go/No Go" standards for new UR engines. Trying to apply them to the marks on the gauge may be tricky because I suspect the signal may not be linear:

@ Idle Speed: 10.1 psi or more
@ 2500 rpm: 32 psi or more

 

I am able to read oil temp with my OBDLink MX+.

 

Can you please list couple of values when your engine has been running for a while? Also if you can list both coolant temp and oil temp.
Still curious how MX+ reads oil temp if there are no sensors? May be it's a calculated value based on other parameters.
Thanks

 

Well well well.

care to lay down some real data on the "not even close" statement?

Where would you measure the "not even close" values at anyway, pan, oil cooler, valleys along the way?

 

Yeah sure I'll snap a pic next time I drive. The oil temp stays very close to the trans oil temp. I believe they both use the same cooler/warmer so maybe they get the value based on that some how.

 

Interesting thing about manufacturers, my 2002 Miata had an oil pressure gauge, but the sending unit was an on/off, but you could replace it with a real sending unit and get the actual pressure at the gauge. The signal did not go thru the ecm. Shame the Tundra signal goes thru the ecm

 

Personally I was more concerned with having values that are no displayed on the dash. Since there is an oil pressure gauge on the dash I don't worry too much about that. I was more concerned with having the trans oil temp than anything else but always monitor the engine oil, trans oil and coolant temps on most drives.

 

I believe the only way to get engine oil cooler on 2019+ is with the tow package. If Tundra still has an engine oil cooler, there are actually separate coolers for transmission fluid and engine oil. Transmission ATF "cooler" is mounted on the transmission. Engine oil cooler is mounted on the oil filter adapter at the front of the engine. But, both coolers are using the same engine coolant as the cooling medium. That's why the temps are close. If you are towing heavy, then ATF temp is going to increase above that of engine oil and coolant due to limited capacity of the transmission cooler.

 

It all depends on the definition of "close". Once stabilized, coolant is going to run about 195 deg, maybe slightly less depending on ambient conditions. I would then expect engine oil temp to probably run from 195 deg to 220 deg depending on load.

Relationship of oil temperature to coolant temperature is an important parameter in engine design. Getting the two temps too far apart can lead to all kinds of cylinder differential expansion problems. For that reason, engine designers deliberately keep the two temps close together.

Re reading oil temp with no sensors: When results do not match what we've been told, we have to consider that our information source may not have been completely omniscient about the topic, or, they had other motives for their "disclosure".

 

Sure. Measure in Death Valley in the summer pulling a travel trailer. Now.drive to the Artic Circle in the winter. Your values and trends will not be close yet they are fine.
Another... 250K miles truck and a brand new truck. That's the not even close that laymen will not consider.

 

This is where the temps leveled out at tonight, it was 45° out.

 

Im on the hunt for oil pressure codes as well. Im sure its on the canbus since theres a gauge in the dash. Probably nobody has figured out the codes yet

 

Realize this is a few month old, but oil warms up much slower than the coolant. I had oil temperature as a factory data display on my Crosstrek and coolant temp on my Scangauge. Especially in the winter, the oil wouldn't get close to coolant temp until I had driven 15 -20 miles on the highway. In the summer, maybe half that distance.