Hi all,

Anyone using the Torque Pro App on an Android device paired with an ELM327 to monitor the above sensors? I'd like to monitor them as I will be seeking to improve cooling after fitting an even smaller SC pulley next week.

I have paired them and can read many different sensors, but not these two unfortunately as they just say 'No data'. Anyone know the PIDs for these sensors?

Would appreciate a steer before I buy an expensive scangauge or equivalent,

Thanks!

 

2nd's proper name is ECT - why measure it? (The car will aim for the range in JTIS)

IAT2 is not an OBD item so you'd need its scaling etc or transfer curve etc as well as PID

Ford vaguely publish some of those, Jaguar don't seem to.

If you get a (clone) Mongoose you should be able read IAT2.

With the Eaton it rapidly gets too hot. That's why avos goes to the TS...

If you want more HP then avos is your best bet.

 

Thanks JagV8,

I have the ECT and IAT2 gauges showing on my Torque app and have just downloaded a plug-in called PID Scanner which I will try later, supposedly lets you see all sensors available to view through OBD and edit PID accordingly to display them - will let you know if it works.

I know that another member, 34by151, was able to view these sensors via Torque on his X350 XJR so I assume I am just just missing something obvious. I'll have to look into a clone mongoose, although I like the practicality of using the mini bluetooth adapter with my smart phone.

I agree, the roots system on a STR is already inefficient at stock boost when driven hard. As I already have a smaller pulley, I wouldn't bother installing an even smaller one on the M112 but appreciate the advice nonetheless! My reason for wanting to monitor coolant temps is that I'll be installing water/meth injection with a larger IC pump on my new set-up and want to monitor the effects.

Thanks

 

I think you're following paths already followed with quite modest gains with the M112.

Quite a number of sensors may not be available during WOT, except with IDS (or WDS - joke).

On my car IAT2 looks to be mode 22 PID 123B

 

Legend, I'll have a play and see if it works later. If it's not too much to ask ECT would also be greatly greatly appreciated!

 

ECT is standard legally-mandated OBD. If your tool doesn't support it you're either looking in the wrong place or it wants throwing away.

 

No luck, even with the manual PID entered for IAT2 no data is received from the sensor without a formula entered and I have no idea what that is.

On the plus side, I've found we can monitor ECT via Engineering Test Mode, but unfortunately IAT2 isn't on there which I would most like to see.

I guess I will be buying a Scangauge unless anyone else has a method of monitoring this live with a handheld device...

 

The only Way I was able to monitor IAT2 was with SDD

I spent some time with Torque trying to setup a PID without success. I think its ones of theses ones you can only read with a mongoose

Cheers
34by151

 

ECT can be read by that tool I think you'll find, as it can by any OBD II tool. The elm327 certainly does it as you can read from its manual.

 

Maybe I just have a faulty adapter then, it's a cheap eBay clone from China so more than likely. Or perhaps a faulty ECT sensor? Only code is a P1000 and all of the emissions tests are completed except Component (which apparently doesn't exist according to JTIS!) No CEL and the car drives perfectly.

 

Codes and monitors have nothing to do with it. Maybe you need to read up on OBD / the tool? Try the elm doc, too.

 

I probably do as I just started playing with it without reading any of the docs. From talking with 34by151, I've concluded I won't be able to get IAT2 via torque so he's suggested some alternative methods I'm going to explore.

Thanks, I will update here with what I eventually (hopefully) use to monitor this live without having to carry around a laptop everywhere.

 

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

Min. 0V
Max. 5V

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 non-linear, non-logical curve...

 

The thermistor is the same as used in the MAF and Coolant Sensor, so an alternative is to buy a simple multimeter, and check the resistance. The resistance values/temperature table is located in the jaguar documents somewhere (sorry don't know by hart which).

 

IATS for AJ26/AJ27 . ECU manual page 129/264.


"Intake Air Temperature Sensor 2 (IATS 2)
A separate intake air temperature sensor (IATS 2), located
on the A bank charge air cooler outlet, provides the
ECM with a “charge air” temperature signal.
As with previous air temperature sensors, the IATS 2 is a
negative temperature coefficient (NTC) thermistor.
Charge air temperature is determined by the ECM by a
change in sensor resistance. The ECM applies 5 volts to
the sensor and monitors the voltage across the pins to
detect the varying resistance.
The IATS located within the MAFS remains active in the
system and is used for diagnostic purposes."

 

I'm not sure why anyone would want to, but it would be simple to code that up.

 

Code is not the issue the connection is the issue
To read IAT2 you would need to be using a mongoose cable not and ELM

Its just not present for generic OBD devices

If you monitor/log the OBD port list of for a few minutes it will give you the pids available. IAT2 is not among them

Cheers
34by151

 

Sorry but that is wrong. An elm327 can read it. Have a look at its manual. (Hint: it's capable of far more than generic OBD.)

BTW I've actually done this...

 

As I suggested earlier if you monitor/log the port this will give you the available pids that you can then decode. If the pid is not present you cant decode it regardless of what your elm manual says.

Some pids are only present to a mongoose as it uses extra pins on the obd port

If you have done it why not share that info?

Cheers
34by151

 

Just follow the manual. Use mode 22, pid 123b. Back comes the value.

Why do you claim that this does not work when you haven't got a clue and apparently can't be bothered to try it?

No extra pins are needed or indeed for most of the cars present. E.g. no extra pins on an S-Type (the forum we're in).

If you want to see how easy it is to use an elm from C, see https://www.scantool.net/scantool/do..._net121src.zip
For python, see http://www.obdtester.com/pyobd-download

Of course as the Elm doc say you can drive it direct but the commands are a bit terse.