These chips are generally "empty" or volatile. They do not store permanent firmware themselves but act as a workspace for the main processor. If you replace one, you generally do not need to "reprogram" the chip itself, though you must ensure the rest of the ECU's firmware is intact.
NEC Corporation (now part of Renesas Electronics). Package Type: SOP-28 (Small Outline Package with 28 pins). Compliance: Lead-free and RoHS compliant. nec b58944 datasheet
The B58944 is optimized for high-speed switching required in horizontal deflection circuits. These chips are generally "empty" or volatile