P0A09 / INF265
P0A09-265Description
The hybrid vehicle converter (DC/DC converter) converts the DC 244.8 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 244.8 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 (DC/DC 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 (DC/DC 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 (DC/DC 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 (DC/DC converter) and alerts the driver if it detects a malfunction.
DTC Logic
DTC Detection Logic
Diagnostic Procedure
Step 1-3:
