Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1589 (21): Motor Power Inverter (MPI) Module Current Signal Circuit Problem: General Description
The motor output torque may not be properly controlled when the output voltage is drifting or freezing due to a faulty MPI (motor power inverter) module current sensor. The sensor output voltage should be 2.5 V ± 50 mV when the input current is 0 A. The current flowing to the MPI module before precharge or while the motor is not turning is 0 A. Therefore, it is possible to detect drifting or freezing from the sensor output voltage at that time.
The MCM (motor control module) samples the current sensor output voltage several times and computes offset voltage at 0 A. If the computed offset voltage is beyond a set value, a malfunction in the sensor is detected and a DTC is stored.
| Execution | Before the pre-charge, immediately after the ignition switch is turned on and during idle stop |
| Sequence | None |
| Duration | 80 milliseconds or more |
| DTC Type | One drive cycle, MIL ON, IMA system indicator ON |
| Condition | Minimum | Maximum |
|---|---|---|
| MCM power-supply voltage | 10.5 V | - |
| Motor (engine) speed | - | 1,500 rpm |
| Motor torque | 0 N.m (0 kgf.m, 0 lbf.ft) | |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.