P0A37-258

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A37-258: Generator Temperature Sensor Circuit Range / Performance

DTC P0A37-258 - Generator Temperature Sensor Circuit Range / Performance

DESCRIPTION

The No. 2 motor temperature sensor detects the temperature of the transaxle fluid. The resistance of the thermistor installed in the No. 2 motor temperature sensor varies with the changes in the transaxle fluid temperature. The construction in the No. 2 motor temperature sensor and how it is connected to the HV control ECU are the same as those of the No. 1 motor temperature sensor P0A2C.





The resistance of the thermistor, which is enclosed in the No. 1 motor temperature sensor, changes in accordance with the changes in the temperature of the motor. The lower the motor temperature, the higher the resistance of the thermistor. Conversely, the higher the temperature, the lower the resistance.
The No. 1 motor temperature sensor is connected to the HV control ECU. The power voltage of 5 V is supplied from the MMT terminal of the HV control ECU to the No. 1 motor temperature sensor via resistor R. Because resistor R and the No. 1 motor temperature sensor are connected in series, the resistance changes with the changes in temperature of the motor, which causes the MMT terminal voltage to also change.
Based on this signal, the HV control ECU limits the load in order to prevent the motor from overheating. Furthermore, the HV control ECU checks the No. 1 motor temperature sensor for a wiring malfunction and the sensor for a malfunction.

Based on the signal provided by the No. 2 motor temperature sensor, the HV control ECU limits the load to prevent the motor from overheating. Furthermore, the HV control ECU checks the No. 2 motor temperature sensor for a wiring malfunction and the sensor for a malfunction.






INSPECTION PROCEDURE

If the information (INF) code 258 is present, replace the hybrid vehicle motor.
HINT: The No. 2 motor temperature sensor is unavailable as an individual service part. Therefore, when replacing it, the hybrid vehicle motor must be replaced.

PROCEDURE

1. REPLACE HYBRID VEHICLE MOTOR ASSEMBLY
NEXT -- COMPLETED