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 MANUALSMITSUBISHI2004LANCER L4-2.0L SOHCREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTCOOLING SYSTEMRELAYS AND MODULES - COOLING SYSTEMRADIATOR COOLING FAN CONTROL MODULETESTING AND INSPECTION
2004 Mitsubishi Lancer L4-2.0L SOHC
Radiator Cooling Fan Control Module: Testing and Inspection
2004 Mitsubishi Lancer L4-2.0L SOHCSECTION Testing and Inspection
FAN CONTROLLER CHECK
1. Remove the fan controller connector.
2. Turn the ignition switch to the ON position, and measure the voltage between the harness-side connector terminals.
Standard value: Battery positive voltage
3. Connect the fan controller connector, and disconnect the condenser fan motor connector.
4. Ensure that the A/C switch is off, and start the engine and run it at idle.
5. Measure the voltage between the fan controller-side connector terminals.
Standard value: 1 Volt or less
6. Turn the A/C switch to the ON position.
WARNING: Stay clear of the fan when the fan starts running.
7. Measure the voltage between the fan controller-side connector terminals while the fan is running. The voltage should repeat the values 1) and 2).
Standard value:
1) 8.2 ± 2.6 Volts
2) Battery positive voltage ± 2.6 Volts
8. If the voltage does not repeatedly change as indicated, replace the fan controller.
FAN CONTROL RELAY CONTINUITY CHECK
1. Remove the fan controller connector.
2. Turn the ignition switch to the ON position, and measure the voltage between the harness-side connector terminals.
Standard value: Battery positive voltage
3. Connect the fan controller connector, and disconnect the condenser fan motor connector.
4. Ensure that the A/C switch is off, and start the engine and run it at idle.
5. Measure the voltage between the fan controller-side connector terminals.
Standard value: 1 Volt or less
6. Turn the A/C switch to the ON position.
WARNING: Stay clear of the fan when the fan starts running.
7. Measure the voltage between the fan controller-side connector terminals while the fan is running. The voltage should repeat the values 1) and 2).
Standard value:
1) 8.2 ± 2.6 Volts
2) Battery positive voltage ± 2.6 Volts
8. If the voltage does not repeatedly change as indicated, replace the fan controller.
FAN CONTROL RELAY CONTINUITY CHECK
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.