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.
2018 Ford Fusion Energi PlatinumFACTORY OEM SERVICE PROCEDURE
Transmission Control System Architecture
| The primary function of the Powersplit transaxle is to manage torque between the electric motors, engine, and driveline. The planetary gear set provides series, parallel and split paths for power distribution from the battery and engine. The torque ratio between the series path and the parallel path is fixed by the geometry of the planetary gear set. The power split between the series path and the parallel path is determined by the relative speeds (all series if vehicle speed is zero and engine is on; all parallel if generator is stopped; split otherwise) The system behavior is similar to a CVT with the effective gear ratio between the engine and the wheels is determined by the split. The transaxle is controlled directly by the Hybrid Powertrain Control Module (HPCM). The HPCM communicates to the Engine Control Module (ECM), ABS Module, Battery Energy Control Module (BECM), and Body Control Module (BCM) using the high speed CAN communication link. The HPCM incorporates a standalone OBD-II system. The HPCM independently processes and stores fault codes, freeze frame, supports industry-standard PIDs as well as J1979 Mode 09 CALID and CVN. The HPCM does not directly illuminate the MIL, but requests the ECM to do so. The HPCM is located inside the Inverter System Controller (ISC) which also houses the motor and generator power electronics and the Variable Voltage Controller (VVC) hardware. It is not internally serviceable with the exception of reprogramming. |
Factory Service Tools
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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.
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