DTC P1587 (19): Motor Power Inverter (MPI) Module Current Signal Circuit Low Input: General Description

The MCM (motor control module) controls the motor output based on the MPI (motor power inverter) module current sensor signals. Under ordinary conditions, the MPI module current sensor has these characteristics: if its input current is -200 A or less, the output voltage is between 4.5 - 4.7 V, or if its input current is +200 A or more, the output voltage is between 0.2 - 0.5 V. If an open in the signal wire, a short to ground, or a faulty ground wiring harness or a faulty sensor power source line occurs, the output voltage stays out of range.

If the input voltage to the MCM is much lower than the normal range, a malfunction such as an open in the signal wire, a short to ground, or a faulty ground wiring harness or a short to ground is detected and a DTC is stored.