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.
System Description (Cooling Fan Control System)
SYSTEM DIAGRAM
| Component parts | Function |
|---|---|
| Crankshaft position sensor | Crankshaft Position Sensor . |
| Intake coolant temperature sensor | Intake Camshaft Position Sensor . |
| Engine coolant temperature sensor 1 | Engine Coolant Temperature Sensor |
| Refrigerant pressure sensor | Refrigerant Pressure Sensor |
| Battery | ECM receives the battery voltage signal. |
| Combination meter | ECM receives the vehicle speed signal via CAN communication. |
| A/C auto amp. | ECM receives the following signals via CAN communication.
|
| ECM | ECM . |
| IPDM E/R | ECM transmits the cooling fan speed request signal via CAN communication. |
| Cooling fan control module | Cooling Fan . |
| Cooling fan motor |
SYSTEM DESCRIPTION
Cooling fan control signal is sent to IPDM E/R from ECM by CAN communication line. Then, IPDM E/R sends ON/OFF pulse duty signal to cooling fan control module. Corresponding to this ON/OFF pulse duty signal, cooling fan control module gives cooling fan motor operating voltage to cooling fan motors. Cooling fan speed is controlled by duty cycle of cooling fan motor operating voltage sent from cooling fan control module.
Cooling Fan Speed Request for Cooling the Engine
Cooling fan speed for cooling the engine is judged based on vehicle speed signal, engine coolant temperature, refrigerant pressure and A/C ON signal.
NO RELATED
Use the Manual With the Right Hardware
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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.