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.
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HOMESERVICE MANUALSMITSUBISHI2005LANCER EVOLUTION L4-2.0L DOHC TURBOREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - COOLING SYSTEMRADIATOR COOLING FAN CONTROL MODULETESTING AND INSPECTION
2005 Mitsubishi Lancer Evolution L4-2.0L DOHC Turbo
Radiator Cooling Fan Control Module: Testing and Inspection
2005 Mitsubishi Lancer Evolution L4-2.0L DOHC TurboSECTION Testing and Inspection
FAN CONTROL MODULE CHECK
Required Special Tool:
^ MB991222: Probe
1. Remove the center under cover.
2. Disconnect the fan control module connector.
3. Turn the ignition switch to the "ON" position, and measure the voltage between the harness-side connector terminals.
Standard value: Battery positive voltage
4. Turn the ignition switch to the "LOCK" (OFF) position, and connect the fan control module connector.
5. Insert special tool MB991222 at the back of the cooling fan motor connector.
6. Connect special tool MB991222 to the circuit tester.
7. Ensure that the A/C switch is off, and start the engine and run it at idle.
8. Measure the voltage between the cooling fan motor connector terminals.
Standard value: 1V or less
9. Turn the A/C switch to the "ON" position.
WARNING: Stay clear of the fan when the fan starts running.
10. Measure the voltage between the cooling fan motor connector terminals while the fan is running. The voltage should repeat the values 1) and 2).
Standard value:
1. 8.2 ± 2.6 V
2. Battery positive voltage ± 2.6 V
11. If the voltage does not repeatedly change as indicated, replace the fan control module.
12. Install the center under cover.
Required Special Tool:
^ MB991222: Probe
1. Remove the center under cover.
2. Disconnect the fan control module connector.
3. Turn the ignition switch to the "ON" position, and measure the voltage between the harness-side connector terminals.
Standard value: Battery positive voltage
4. Turn the ignition switch to the "LOCK" (OFF) position, and connect the fan control module connector.
5. Insert special tool MB991222 at the back of the cooling fan motor connector.
6. Connect special tool MB991222 to the circuit tester.
7. Ensure that the A/C switch is off, and start the engine and run it at idle.
8. Measure the voltage between the cooling fan motor connector terminals.
Standard value: 1V or less
9. Turn the A/C switch to the "ON" position.
WARNING: Stay clear of the fan when the fan starts running.
10. Measure the voltage between the cooling fan motor connector terminals while the fan is running. The voltage should repeat the values 1) and 2).
Standard value:
1. 8.2 ± 2.6 V
2. Battery positive voltage ± 2.6 V
11. If the voltage does not repeatedly change as indicated, replace the fan control module.
12. Install the center under cover.
RENDER: 1.0x
NO RELATED
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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.