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.
Power Inverter Module (PIM)
DESCRIPTION
| 1 - Coolant Outlet Port |
| 2 - Low Voltage Vehicle Wire Harness Connector |
| 3 - Coolant Inlet Port |
| 4 - PIM Assembly |
| 5 - Low Voltage Resolver Connector |
| 6 - High Voltage Phase Motor Connector |
The Motor Control Processor a (MCPA) is integral to the Power Inverter Module (PIM). The MCPA provides the strategy for charging the 12 volt battery and the Power Pack Unit (PPU). The MCPA monitors the High Voltage (HV) system, B+, switched ignition, and Controller Area Network (CAN) bus circuits for any concerns. The MCPA can also detect any internal failures, high temperature and resolver failures.
The MCPA monitors the RPM of the Electric Drive Motor (EDM). The MCPA can increase or decrease the torque of the electric motor to compensate through the PIM HV electric motor connection.
The Gen2 PIM is a dual 125kW inverter that supports the use of E-Motors, is protected by a serviceable fuse behind a cover in the HV PDC. The operating voltage range is between 180-450 VDC.
The High Voltage (HV) Power Inverter Module (PIM) is located under the hood, is made of aluminum and is fully insulated. The PIM is part of the Power Electronics Cooling loop to remove the heat that is generated during operation.
- PIM Electronic Control Module Vehicle Connection
- High Voltage Charging Cable
- Coolant "IN" from the Integrated Dual Charging Module IDCM
- Coolant "OUT" to the transmission cooler
- High Voltage connection to the Electric Drive Motor (EDM)
OPERATION
The PIM is the connection between the battery pack and EDM. It sends the High Voltage Direct Current (HVDC) to power the motors for propulsion.
The amount of current controls the EDM torque.
The frequency of the three-phase AC determines the EDM speed and rotation.
The PIM is also responsible for high voltage battery system temperature control utilizing the following inputs and outputs:
Inputs
- Heater Core Coolant Inlet Temperature Sensor
- Electric Coolant Heater Inlet Temperature Sensor
- High Voltage Battery Coolant Inlet Temperature Sensor
- High Voltage Battery Coolant Outlet Temperature Sensor
- Low Temperature Radiator Coolant Inlet Temperature Sensor
- Passive Pump Coolant Inlet Temperature Sensor
- Power Electronics Inlet Temperature Sensor
- Power Electronics Outlet Temperature Sensor
Outputs
- Electric Coolant Heater
- Auxiliary Coolant Pump
- Low Temperature Active Coolant Pump
- Low Temperature Passive Coolant Pump
- High Temperature Shut-off Valve
- High Temperature Cabin Valve
The PIM controls the high-level activity of all of the electric powertrain components when the vehicle is plugged in. It communicates with Integrated Dual Charger Module (IDCM), Battery Pack Control Module (BPCM) and Instrument Panel Cluster (IPC) to achieve the following functions:
- Initiate Charging
- Report Charging Status
- Report Charging System Fault
- Control Charging
- Execute Scheduled Charge
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.