DTC P0C3A-621: DC / DC Converter Temperature Sensor "A" Low; DTC P0C3B-622: DC / DC Converter Temperature Sensor "A" High; DTC P0C3F-623: DC / DC Converter Temperature Sensor "B" Low; DTC P0C40-624: DC / DC Converter Temperature Sensor "B" High [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
The MG ECU detects the temperature of the boost converter using the temperature sensor built into the boost converter. The boost converter using the temperature sensor outputs voltage which changes between 0.5 and 4.5 V in response to a change in temperature. The higher the boost converter temperature, the lower the output voltage. Conversely, the lower the boost converter temperature, the higher the output voltage. The MG ECU limit load based on signals sent from the boost converter temperature sensor to help prevent overheating. The MG ECU also detects malfunctions in the boost converter temperature sensor and its wiring.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0C3A | 621 | Open or short to GND in the boost converter temperature sensor (upper) signal circuit | Inverter with converter assembly |
| P0C3B | 622 | Short to +B in the boost converter temperature sensor (upper) signal circuit | |
| P0C3F | 623 | Open or short to GND in the boost converter temperature sensor (lower) signal circuit | |
| P0C40 | 624 | Short to +B in the boost converter temperature sensor (lower) signal circuit |