DTC P0A08-264: DC / DC Converter Status Circuit: Description

WARNING: This page is about a different variant/trim than selected.

The hybrid vehicle converter (DC/DC converter) converts the DC 288 V of the HV battery into DC 12 V in order to supply power to areas such as the vehicle's lighting, audio, and ECU systems. In addition, it charges the auxiliary battery. A transistor bridge circuit initially converts DC 288 V into alternating current, and a transformer lowers its voltage. Then, it is rectified and smoothed (into DC) and converted into DC 12 V. The hybrid vehicle converter controls the output voltage in order to keep a constant voltage at the terminals of the auxiliary battery.

The hybrid vehicle control ECU uses the NODD signal line to transmit a stop command to the hybrid vehicle converter and receive signals indicating the normal or abnormal condition of the 12 V charging system. If the vehicle is being driven with an inoperative hybrid vehicle converter, the voltage of the auxiliary battery will drop, which will prevent the continued operation of the vehicle. Therefore, the hybrid vehicle control ECU monitors the operation of the hybrid vehicle converter and alerts the driver if it detects a malfunction.

Fig 1: Identifying Hybrid Vehicle Converter System Diagram

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A08	264	DC/DC converter malfunction	Wire harness or connector Inverter water pump assembly (w/ motor) Inverter cooling system Hybrid vehicle transaxle assembly No. 3 wire frame Rear traction motor with transaxle assembly Inverter with converter assembly DCDC-S fuse Fusible link block assembly (MAIN) Fusible link block assembly (DCDC, HV R/B NO. 1) IGCT NO. 2 fuse Hybrid vehicle control ECU