P0A10-263

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A09-265: DC / DC Converter Status Circuit Low Input

DTC P0A09-265 - DC / DC Converter Status Circuit Low Input

DTC P0A10-263 - DC / DC Converter Status Circuit High Input

DESCRIPTION

The DC / DC converter converts the DC 201.6 V of the HV battery into DC 12 V in order to supply power to the vehicle's lighting, audio and ECU systems. In addition, it charges the auxiliary battery.
A transistor bridge circuit initially converts DC 201.6 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 DC / DC converter controls the output voltage in order to keep a constant voltage at the terminals of the auxiliary battery.





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






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - DC / DC CONVERTER)




(a) Disconnect the H16 HV control ECU connector.




(b) Disconnect the C5 DC / DC converter connector.
(c) Turn the power switch ON (IG).
(d) Measure the voltage between the terminal of the HV control ECU connector and body ground.
Standard voltage:





(e) Turn the power switch OFF.
(f) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):





Standard resistance (Check for short)





(g) Reconnect the DC / DC converter connector.
(h) Reconnect the HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY