P0A02

DTC P0A02-719 Motor Electronics Coolant Temperature Sensor Circuit Low
DTC P0A03-720 Motor Electronics Coolant Temperature Sensor Circuit High

DESCRIPTION

DTC Detection Condition:

The hybrid vehicle control ECU detects HV coolant temperature through the coolant temperature sensor built into the inverter with converter assembly. The inverter cooling system is the same as that for MG2 or MG1, and operates independently of the engine cooling system. The hybrid vehicle control ECU controls the inverter cooling system to prevent overheating based on signals from the HV coolant temperature sensor. The inverter with converter assembly monitors cooling system operation and detects malfunctions in the HV coolant temperature sensor and the circuit.

Step 1:

INSPECTION PROCEDURE

CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.