P0A2B-248

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A2B-248: Drive Motor "A" Temperature Sensor Circuit Range / Performance

DTC P0A2B-248 - Drive Motor "A" Temperature Sensor Circuit Range / Performance

DTC P0A2B-250 - Drive Motor "A" Temperature Sensor Circuit Range / Performance

DESCRIPTION





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.







INSPECTION PROCEDURE

If the information (INF) code 248 or 250 is present, replace the hybrid vehicle motor.
HINT: The No. 1 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