DTC P0A02-719 Motor Electronics Coolant Temperature Sensor Circuit Low; DTC P0A03-720 Motor Electronics Coolant Temperature Sensor Circuit High: Description
WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
The HV control ECU detects HV coolant temperature through the coolant temperature sensor built into the inverter. The inverter cooling system is the same as that for the Motor or Generator, and operates independently of the engine cooling system. The HV control ECU controls the inverter cooling system to prevent overheating based on signals from the coolant temperature sensor. The ECU also monitors cooling system operation and detects malfunctions in the HV coolant temperature sensor and the circuit.
DTC DETECTION TROUBLE CONDITION
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0A02 | 719 | GND short in HV coolant temperature sensor circuit | w/ converter inverter assembly (MG ECU) |
| P0A03 | 720 | Open or +B short in HV coolant temperature sensor circuit | w/ converter inverter assembly (MG ECU) |