I have found an error in the datasheet for FRDM-KL25Z. It is regarding to I2C bus on pins PTE0 and PTE1.
In FRDM-KL25Z User's Manual (Rev 2).pdf can be found a picture with pinout stating that pin PTE1 is positioned on header J2 pin 20 and PTE0 is positioned on header J2 pin 18. So far so good.
However in FRDM-KL25Z Pinouts (Rev 1.0).pdf is written that that pin PTE0 refers to I2C1_SDA and is positioned on header J2 pin 20 and pin PTE1 refers to I2C1_SCL and is positioned on header J2 pin 18. It is not correct, SCL and SDA are SWAPPED!
I see that it is correct on FRDM-KL26 board, so somewho should fix it for FRDM-KL25. I was not able to find direct contact from NXP.