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 MANUALSMITSUBISHI2004ECLIPSE L4-2.4L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESINSPECTION PROCEDURE 28
2004 Mitsubishi Eclipse L4-2.4L SOHC
Inspection Procedure 28
2004 Mitsubishi Eclipse L4-2.4L SOHCSECTION Inspection Procedure 28
Fans (radiator fan) is inoperative
CIRCUIT OPERATION
- The ECM or PCM sends a duty signal to the fan controller according to engine coolant temperature, vehicle speed, and the condition of the A/C switch. (The closer the average voltage at the terminal comes to five volts, the higher the fan speed becomes.)
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Malfunction of the fan motor relay.
- Malfunction of the fan motor.
- Malfunction of the fan controller.
- Improper connector contact, open or short-circuited harness wire.
- ECM or PCM failed.
DIAGNOSIS
STEP 1. Check connector C-49 at ECM or connector C-50 at PCM for damage.
Q: Is the connector in good condition?
YES: Go to Step 2.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.
STEP 2. Measure the output voltage at ECM harness side connector C-49 or PCM harness side connector C-50 .
1. Disconnect the connector C-49 or C-50 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal No. 21 or No. 18 and ground.
- Voltage should be between 4.8 and 5.2 volts. (Fan rotates at high speed.)
4. Connect a jumper cable between terminal No. 21 or No. 18 and ground.
- The fan should stop.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and fan condition normal?
YES: Replace the ECM or PCM. Then confirm that the malfunction symptom is eliminated.
NO: Go to Step 3.
STEP 3. Check for open circuit and short circuit to ground and harness damage between fan controller A-30 (terminal No. 2) and ECM connector C-49 (terminal No. 21) or PCM connector C-50 (terminal No. 18) .
NOTE: Check harness after checking intermediate connector C-07. If intermediate connector is damaged, repair or replace them. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.
Q: Is the harness wire in good condition?
YES: Refer to Engine Cooling Diagnosis - Symptom Chart.
NO: Repair it. Then confirm that the malfunction symptom is eliminated.
Radiator Fan A/C Condenser Fan Circuit Part 1:
Radiator Fan A/C Condenser Fan Circuit Part 2:
CIRCUIT OPERATION
- The ECM
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Malfunction of the fan motor relay.
- Malfunction of the fan motor.
- Malfunction of the fan controller.
- Improper connector contact, open or short-circuited harness wire.
- ECM
DIAGNOSIS
STEP 1. Check connector C-49 at ECM
Q: Is the connector in good condition?
YES: Go to Step 2.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.
STEP 2. Measure the output voltage at ECM harness side connector C-49
1. Disconnect the connector C-49
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal No. 21
- Voltage should be between 4.8 and 5.2 volts. (Fan rotates at high speed.)
4. Connect a jumper cable between terminal No. 21
- The fan should stop.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and fan condition normal?
YES: Replace the ECM or PCM. Then confirm that the malfunction symptom is eliminated.
NO: Go to Step 3.
STEP 3. Check for open circuit and short circuit to ground and harness damage between fan controller A-30 (terminal No. 2) and ECM connector C-49 (terminal No. 21)
NOTE: Check harness after checking intermediate connector C-07. If intermediate connector is damaged, repair or replace them. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.
Q: Is the harness wire in good condition?
YES: Refer to Engine Cooling Diagnosis - Symptom Chart.
NO: Repair it. Then confirm that the malfunction symptom is eliminated.
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.