One quick technical question...AFAIK, a car that has a Mass Air setup won't have a MAP, and a MAP car won't have a MAF....except a rare car here and there like a Grand National 3.8 Turbo...

Of course I know the X-308 is a MAF car and I don't recall seeing a map or baro sensor anywhere, just an intake air temp... My ScanTool reported back a MAP signal but it was dead, I'm assuming it's the scantool's equivalent of "Not Applicable" but just checking. No MAP, correct?

 

The airflow is indeed measured via the MAF, but (at least) from the 2001 model years, a MAP sensor is used for checking if the EGR works properly. You could also use the MAP input for a quicker fueling response, as the MAF responds later/slower to a quick throttle change, I just don't know if Jaguar used that already from 2001.

 

Lots of modern cars have all of MAF (sometimes 2), MAP (commonly 2) & BARO. Why were you wondering anyway?

 

Was wondering because my scantool reads a sensor,either MAP or Baro (IIRC, it doesn't specify which) and the signal is always zero.

Normally when I see this, it just means that the particular sensor or data is not applicable to that vehicle so it displays it as naught.

I just wanted to make sure I'm not overlooking a critical piece of data right out of the gate. I've made a post about this already and have been too busy to dig much deeper, but my next step is going to be verifying good fuel pressure under load, then ohming the coil packs one by one and if they all pass, looking at the cam & crank position sensors.

Car intermittently falls on its face at high throttle positions or high-load situations. Will run all the way to the rev limiter if kicked down at higher speeds but the higher the engine load and lower the speed, the worse it breaks up, which typically makes me look at the ignition system first.

OBD-II says all is peachy and it lists all systems as PASS, including Misfire Count, EVAP, O2 output & cycling, etc.

 

Sounds like tool only mostly knows what it's doing but you can tell which sensors your car has from the electrical guide - free download as part of JTIS but also on various net sites. The OBD monitors are a guide that nothing serious was wrong at the time they were run (a few are run constantly). Codes can only flag if a problem is fairly solidly there (to avoid endless false codes caused by such as potholes).

I'm an S-Typer really and they do have BARO, MAP & MAF. I'm iffy on which electrical guide exactly will be your car.

Sometimes an OBD tool with live data reveals something odd be it fuel trims or a sensor which is out of where it should be yet plausible to a computer.

 

/\ Yeah, been through that bit...

STFT averages 0% both banks, and LTFT is low as well, less than 5% +/- and match bank-to-bank. O2 Lambda's are good, cycling times are good, they're all a pass.

No codes are stored. No scantool I've used (3, including a Snap-On Modus) will give me enhanced data or ANYTHING beyond very basic OBD-II functionality. I can buy a $90 update for my personal, laptop-based tool I use personally and on the side, but there's no guarantee it will work, only a vague promise of "Enhanced Jaguar Functionality"...

Back to the old-school methodology I go... I just need to stop being lazy and dig into this thing.