DTC P1440 (57): IMA System Problem: General Description

An open in the gate drive wire, an insulated gate bipolar transistor (IGBT) OFF failure, and an open in the motor power cable or in the motor coil causes a deviation from the target value of torque in the integrated motor assist (IMA) system. By monitoring changes in phase current when an abnormality occurs, the function monitor detects a malfunction in the IMA system. An open in the gate drive wire or in the motor power cable causes an increase in the other two normal phases. current to compensate for a decrease in the phase when the motor control range is not in the low speed range.