Hi all,
I've upgraded my supercharger upper pulley for my Jag XJR coming from 2001. Installed high flow coolant pump and installed water injection to prepare the engine for bottom pulley upgrade. With water/menth I expected also the positive impact on performance however I can not feel any difference. That's why I started to investigate the other means to measure by how much the air is cooled down by spraying water before going with bigger water nozzle. The problem is that with ELM327 OBDII scanner you can not read the IAT2 sensor because this sensor is not in the standard list of parameters.

I've read many threads many people were talking about it here. I saw that there should be at least two member who are able to configure Torque for mobile so that the custom PID for IAT2 can be created: JagV8 and Mafioso. So we need to know:
OBD2 Mode and IPD (in hex)
Equation
OBD header to use

It would be great if somebody could help - many of us would benefit. I'd appreciate very much if JagV8 and Mafioso jump into this thread.

 

Nobody knows?

 

anybody?

 

I think the lack of responders is due to two distinct reasons.
1) Many of the folks you would assume would know these things just plain do not- their actual knowledge of the ecu is superficial.
2) The few that do know, are not in the helpful mode since they intend to sell their knowledge in one form or aniother. I do not blanme them for that!

 

I didn't answer because I did not know about the post - despite sending a PM the OP failed to say he had posted it let alone where.

I don't read this forum and don't know the XJ car's computers. I also don't know the app concerned.

I have an STR and know it well plus have an OE-type OBD tool and suggest the OP get a similar tool.

 

Yep, Both IDS and AutoEnginuity with Jaguar extensions read the IAT2, but I think Mr. Mindugs is looking for some way to indicate in driving real time and not run the computer apps. I suppose you could reverse engineer it by sniffing the usb port signal for the sanner and figure it out.

 

What I'm looking - the possibility to create the custom PID in Torque app for mobile to monitor the IAT2 at any moment during driving

 

Read with OE-type tool, sniffing packets to see what it's doing.

 

Thanks for advice. I gave up with this. OE-type scanning tools are too expensive for my need of only one parameter.

 

I was looking into this recently, albeit for the X350 XJR. IAT2 values on Torque would be nice!

When I look in the SDD, it tells me PID 123B: Intercooler air temperature after intercooler.

Min. 0V
Max. 5V

What the span of this 0-5V sensor is we don't know, yet....

The IAT1 sensor is -40°C to +215°C and it's also a 0-5V sensor .

One way to do it would be to get both IAT1 & IAT2 sensors, and measure the output in volts to compare. Find a freezer that can do -40°C (mine in the kitchen only gets to about -20°C) and use a kitchen oven for the 215°C.

If Torque will read the voltage signal of PID 123B, then it's halfway there to figure out what the actual values are & get it displayed in °C...

 

Should be like the other thread (Transmission PID) but easier.

IAT2 on my car is also 123B.

Readable with mode 22. I've tried it. I don't offhand know the formula but probably the same as other temperature sensors. (See SG / XGauge / SAE standards / wikipedia I expect / etc).

I think IAT1 is mode 22 000F

 

Anyone want to try reading IAT2 / IAT1 this way?

 

Our man pulled the IAT2 range out of the factory tune.

This is for the AJ33S, AJ34S and AJ40 (X150 XKR), might be the same for the AJ26S and AJ27S, still waiting to crack that tune file open.



Yup, it's not linear, it's not logical either. This is probably why the IDS/SDD only shows volts, not an actual temperature, because there's no way to make a formula for this...