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Transcript
05–483 DIAGNOSTICS – HYBRID CONTROL SYSTEM 05J9B–01 DTC P0A09/265 DC/DC CONVERTER STATUS CIRCUIT LOW INPUT DTC P0A10/263 DC/DC CONVERTER STATUS CIRCUIT HIGH INPUT CIRCUIT 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. Inverter DC 201.6 V DC/DC Converter Auxiliary Battery Input Filter AMD GND IG Converter Control Circuit S NODD VLO IDH HV Control ECU A/C ECU A93722 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 malfunction. DTC No. INF Code DTC Detection Condition Trouble Area P0A09 265 Open or GND short in NODD signal circuit of DC/ DC converter Wire harness or connector w/ converter inverter assembly P0A10 263 +B short in NODD signal circuit of DC/DC converter Wire harness or connector w/ converter inverter assembly 2004 Prius – Preliminary Release (RM1075U) Author: Date: 647 05–484 DIAGNOSTICS – HYBRID CONTROL SYSTEM WIRING DIAGRAM DC/DC Converter HV Control ECU 4 24 V NODD C5 H16 NODD A92298 INSPECTION PROCEDURE 1 CHECK HARNESS AND CONNECTOR(HYBRID VEHICLE CONTROL ECU – DC/DC CONVERTER) (a) (b) (c) (d) H16 Disconnect the H16 HV control ECU connector. Disconnect the C5 DC/DC converter connector. Turn the power switch ON (IG). Measure the voltage between the terminal of the HV control ECU connector and body ground. Standard: NODD HV Control ECU Connector A65745 (e) (f) Wire Harness Side: C5 NODD Tester Connection Specified Condition NODD (H16–24) – Body ground Below 1 V Turn the power switch OFF. Check the resistance between the wire harness side connectors. Standard (Check for open): Tester Connection Specified Condition NODD (H16–24) – NODD (C5–4) Below 1 Ω Standard (Check for short): Front View DC/DC Converter Connector A92030 (g) (h) Tester Connection Specified Condition NODD (H16–24) or NODD (C5–4) – Body ground 10 kΩ or higher Reconnect the DC/DC converter connector. Reconnect the HV control ECU connector. NG REPAIR OR CONNECTOR REPLACE HARNESS OR OK REPLACE W/CONVERTER INVERTER ASSY (See page 21–23) 2004 Prius – Preliminary Release (RM1075U) Author: Date: 648