MAZDA · 2026-04-22
DESCRIPTION Some vehicles may experience one or more of the following DTCs with the Hybrid system warning light on. This may be caused by an issue with the sub battery located under the passenger floor. P143B Backup power supply system: Sub battery power supply low input. • U3008:01 BPS Backup power supply unit input/output circuit over-current/voltage malfunction. • U3003:17 BPS The output voltage sensor in the backup power supply unit detects that the voltage is standard or more. • U04C0:00 PCM Backup power supply unit internal malfunction. • REPAIR PROCEDURE 1. Remove the sub battery according to the instructions on MGSS. CX-90 (LEAD ACID BATTERY (SUB) REMOVAL/INSTALLATION) • CX-70 (LEAD ACID BATTERY (SUB) REMOVAL/INSTALLATION) • 2. Test the battery's voltage using a digital voltmeter…