DTC P0A90-251: Drive Motor "A" Performance [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.

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in motor. The system controls the rotation of the magnetic field in accordance with the rotating position and speed of the rotor. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls motor speed by regulating the frequency of the alternating current. Furthermore, the system properly controls the rotating magnetic field and the angle of the rotor magnets in order to generate high torque in an efficient manner, even at high speeds.

HINT:

The term "drive motor A" indicates MG2.

Fig 1: Identifying Drive Motor Operation Diagram

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A90	251	Motor magnetic force deterioration or same phase short circuit	Hybrid vehicle transaxle assembly Motor cable Inverter with converter assembly Wire harness or connector Power management control ECU