DTC P1588 (20): Motor Power Inverter (MPI) Module Current Signal Circuit High Input: General Description

The motor control module (MCM) controls the integrated motor assist (IMA) motor output based on the motor power inverter (MPI) module current sensor signal. Under ordinary conditions, the MPI module current sensor shows certain 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. When an open in the signal wire, a short to ground, a faulty sensor power supply cable or a faulty ground wiring harness occurs, the output voltage stays out of the aforementioned range.

If the input signal voltage to the MCM is much higher than the normal range, a malfunction in the sensor ground wiring harness is detected and a DTC is stored.