Hi All,

This 2004 XJ8 has an intermittent P0101 code (sets and resets itself). The following has been done:

-MAF replaced (twice)
-Air filter box replaced

Here is the freeze data

Trouble code P0101 (MAF performance out of range)
ABSLT TPS(%) 7.5
ENGINE (RPM) 1579
CALC LOAD(%) 17.6
MAF (LB/M) 1.27
MAP ("HG") 7.4
COOLANT (*F) 196
IAT (*F) 93
IGN ADV (DEG) 37.5
LT FTRM1(%) 2.3
ST FTRM1(%) 2.3
LT FTRM2(%) 0.8
ST FTRM2(%) 0.0
VEH SPEED (MPH) 63
FUEL PRESSURE (PSIG) 56
FUEL SYS1 CLSD
FUEL SYS2 CLSD

Can someone please provide interpretation for this data? Is there a systematic way of troubleshooting a MAF and ECU operation?
The car has been to the dealership multiple times for this problem, and the next step is ECU replacement.

Thanks in advance

 

Do you have a k and N air filter by any chance?

 

No I do not. No modification at all, everything is OEM.

kind regards

 

this is what the JTIS says, did you check for air leaks?