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

To manage the temperature of the motor power inverter (MPI) module, the DC-DC converter, and the battery module, 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 MCM operates the IPU module fan, it should be operated within a specified speed range. The MCM compares the actual IPU module fan speed to the IPU module fan duty cycle, and if the actual speed does not reach a specified value, the MCM detects a malfunction and stores a DTC.