T33 - is ambient temperature CORRECTLY reported to OBDII?

[V6er]

Yello!

so - T33 Rogue, MY2023. via OBD2 adapter and software(Car Scanner Pro) - Ambient temperature seems to be something not that ambient.
On instrument panel outside temperature seems to be correct, but via obd2 - not.

Has anybody noticed that too?

Any ideas how to talk to somebody in Nissan about it...? tried dealerships and their "master technicians", tried nissan customer service where some *** called me clearly stating that he "is not a lawyer"(all cars should be obd2 correct?), not a technician and he doesn't care what my issue is. he wanted to let me know his opinion... not helpful.

[D1dad]

My scan gauge 2 shows it and it’s definitely not right. Everything else seems to be correct. I just wish I could get oil temps, but it’s not an option.

[VStar650CL]

Ambient temp is a standard PID but not required, and there are two things which may be affecting it. First, the dash shows a calibrated value, but an aftermarket scanner may be showing the raw value. Second, the PID will upload degC and not degF, so you may need to convert if your scanner doesn't handle it properly.

[V6er]

Ambient temp is a standard PID but not required, and there are two things which may be affecting it. First, the dash shows a calibrated value, but an aftermarket scanner may be showing the raw value. Second, the PID will upload degC and not degF, so you may need to convert if your scanner doesn't handle it properly.

still - if it is there (it isn't on T32) it should be correct, not garbage. (from my perspective).
about calibrated or not - if i start the car in the morning - it is ok(dash matches obd2 data). I drive for... say 20minutes... it is elevated on OBD2, but not on dash... I drive at noon, on dash it is ok, on obd2 it has skyrocketed. (like dash is 25C, obd2 has it at 60-75)
seems to me - that information fed on obd2 is intake air temp, not ambient.

same crap on kia-hyundais, neighbours bmw had same issue... so... larger conspiracy here

[V6er]

My scan gauge 2 shows it and it’s definitely not right. Everything else seems to be correct. I just wish I could get oil temps, but it’s not an option.

haven't checked Car Scanner Pro lately, also EconTools author(for T32 his software is great!) will hopefully come up with something...
also EGT, fuel pressure etc.

[VStar650CL]

seems to me - that information fed on obd2 is intake air temp, not ambient.

It's possible it is IAT and not ambient, but if so, that's on the scanner manufacturer. The C3+ reads both correctly.

[V6er]

seems to me - that information fed on obd2 is intake air temp, not ambient.

It's possible it is IAT and not ambient, but if so, that's on the scanner manufacturer. The C3+ reads both correctly.

https://en.wikipedia.org/wiki/OBD-II_PIDs
46hex, 70dec - ambient air temperature
68hex, 104dec - intake air temperature.

C3+ (I am guessing - official scanner for nissan) - if it reads via nissan protocol(also called consult?) is different story. I am talking about obd2.

p.s. that was issue with "master" tech at nissan dealership - i spoke with the guy at least twice, but I think he didn't got difference between OBD2 and nissans protocol...

[VStar650CL]

That's because there's no real difference. OBD-II just means it's an SAE J1979 compliant protocol that can be read by any compliant scanner, and some codes are specified as "required" because of EPA. Proprietary stuff uses the same protocols and formats, it just doesn't need to be on SAE's standard list because it's manufacturer specific. IAT and ambient are both standard, so if your scanner can't tell the difference, it's the fault of the scanner's software.

[V6er]

you start to sound like that "master tech" @ dealership - instead of digging into issue or just clearly saying "not interested" or "don't care", starts blaming everything and anything in the world...

1) intake air temp goes up as engine heatsoaks. for example with T33 rogue - if I have been driving, during the day ambient is 25C, while intake can easily be 75C. if you don't see difference between those two (especially on turbo engine)...........

2) I don't see significance in "required" vs "not". either nissan is making cars obd2 compliant or not. if they decide "this we will do properly" and "that we will make via GI tract"... it just means car, basically, is NOT obd2.

3) i requested specific PID, recieved raw values. and I did it with different hardwares, different softwares. so - again - nissan did crappy job(from all the evidence I was able to gather).

I would LOVE to see anybody present me with THEIR "quality" tools that our t33 gives correct data on obd2 protocol pid 46hex. haven't found one.
can't find a way to "knock on the right door"@nissan either.

[VStar650CL]

First of all, the data comes from different places. IAT comes from the ECM, ambient comes from the HVAC. So your scanner is getting the information second hand from a non-compliant device, and if something gets lost in that translation using a non-Nissan scanner, c'est la vie. The Consult3+ gets the info direct from the HVAC, unlike almost all aftermarket scanners. Second, the ECM firmware comes from Hitachi and the HVAC probably from Calsonic (but maybe Continental, Alps, or someone else). B!tc# to them, not Nissan. Third, I am a Nissan master tech, with an electrical/EV specialty. So please, spare me.

[V6er]

what value has "master tech" if it cannot differentiate between obd2 and nissan protocol/s...

[VStar650CL]

Spare me.

[V6er]

it is not about you or your inability to understand such basic things...

[VStar650CL]

With your great knowledge, I'm sure you're familiar with what Mark Twain supposedly said about fools and onlookers. In the interests of not confusing the onlookers, you now have this discussion all to yourself.

[V6er]

you _really_ think that your "participation" brought something of value to topic?!