Is it possible to create EEPROM error using ECC in MPC5746R for EEPROM fault check testing.
Yes, it is possible by FLASH over-programming as shown for instance in following example:
Example MPC5777C-1b+2b_FLASH_ECC_error_injection GHS614
What is different in ECC event response of data flash area on MPC57xx as discussed here:
ECC inject test in MPC5744P EEPROM
Retrieving data ...