DTC P1448 (63): Intelligent Power Unit (IPU) Module Fan Problem: General Description

To control the motor power inverter (MPI) module, the DC-DC converter, the A/C compressor driver, and the battery module temperature, the integrated motor assist (IMA) system is equipped with an intelligent power unit (IPU) module fan.

When a malfunction occurs in the IPU module fan, the motor assist is unable to regenerate and the IMA system is shut down because the module temperature increases. A malfunction in the IPU module fan is detected to avoid problems caused by overheating.

If the IPU module fan is functioning normally, when the battery condition monitor (BCM) module operates the IPU module fan, it should operate within a specified speed range.

The BCM module compares the actual IPU module fan speed to the IPU module fan duty cycle, and if the actual speed does not reach the specified value, a malfunction is detected and a DTC is stored.