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Home >> Mitsubishi >> 2000 >> Eclipse GT V6-3.0L SOHC >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Inspection Procedure 5

Inspection Procedure 5















CIRCUIT OPERATION
- The fan control module is powered from fusible link number 5.
- The ECM [M/T] or PCM [A/T] judges the required revolution speed of radiator fan motor and condenser fan motor using the input signals transmitted from A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor. The ECM [M/T] or PCM [A/T] activates the fan control module to drive the radiator fan motor and condenser fan motor.

TECHNICAL DESCRIPTION
- The cause could be a malfunction of the fan control module power supply or ground circuit.
- The cause could also be a malfunction of the fan control module or the ECM [M/T] or PCM [A/T].

TROUBLESHOOTING HINTS
- Malfunction of fusible link
- Malfunction of fan control relay
- Malfunction of fan control module
- Malfunction of ECM [M/T] or PCM [A/T]
- Damaged wiring harness or connector

DIAGNOSIS
Required Special Tool: MB991223: Harness Set

STEP 1. Check The Circuit At Fan Control Module Connector A-30.





1. Disconnect fan control module connector A-30, and measure at the harness side connector.
2. Measure the voltage between terminal number 3 and ground.
- When the ignition switch is turned to "ON" position, voltage should be battery positive voltage.
If abnormal, go to Step 2.
If normal, go to Step 7.

STEP 2. Check The Fan Control Relay.
Refer to P.14-23.
If the fan control relay is faulty, replace it. Then go to Step 10.
If normal, go to Step 3.

STEP 3. Check For Continuity Between Fusible Link Number 5 And Fan Control Relay Connector A-13X.





If any harness wires between fusible link number 5 and fan control relay connector A-13X are damaged, repair or replace them.
Then go to Step 12.
If normal, go to Step 4.

STEP 4. Check For Continuity Between Fan Control Relay Connector A-13X And Fan Control Module Connector A-30.








If any harness wires between fan control relay connector A-13X and fan control module connector A-30 are damaged, repair or replace them.
Then go to Step 12.
If normal, go to Step 5.

STEP 5. Check For Continuity Between MFI Relay Connector A-21X And Fan Control Relay Connector A-13X.





If any harness wires between MFI relay connector A-21X and fan control relay connector A-13X are damaged, repair or replace them.
Then go to Step 12.
If normal, go to Step 6.

STEP 6. Check For Continuity Between Fan Control Relay Connector A-13X And Ground.





If any harness wires between fan control relay connector A-13X and ground are damaged, repair or replace them. Then go to Step 12.

STEP 7. Check The Circuit At Fan Control Module Connector A-30.





1. Disconnect fan control module connector A-30, and measure at the harness side connector.
2. Measure the resistance between terminal number 1 and ground.
- Should be less than 2 ohm.
If open circuit, go to Step 8.
If less than 2 ohm, go to Step 9.

STEP 8. Check The Harness Wire Between Fan Control Module Connector A-30 And Ground.





If any harness wires between fan control module connector A-30 and ground are damaged, repair or replace them.
Then go to Step 12.

STEP 9. Check The Circuit At ECM Connector C-51 [M/T] Or PCM Connector C-52 [A/T].





1. Connect ECM connector C-51 [M/T] or PCM connector C-52 [A/T].
2. Start the engine and allow it to idle.
3. Measure the voltage between terminal number 18 and ground.
- Voltage should be 0.7 volt or more (When the radiator fan is operating)
If less than 0.7 volt, go to Step 10.
If 0.7 volt or more, go to Step 11.

STEP 10. Check The Harness Wire Between ECM Connector C-51 [M/T] Or PCM Connector C-52 [A/T] And Fan Control Module Connector A-30.











If any harness wires between ECM connector C-51 [M/T] or PCM connector C-52 [A/T] and fan control module connector A-30 are damaged, repair or replace them. Then go to Step 12.
If harness wires are in good condition, go to Step 11.

NOTE: If intermediate connector C-07 is damaged, repair or replace it. Refer to Group 00E, Harness Connector Inspection.

STEP 11. Check The Fan Control Module At ECM Connector C-51 [M/T] Or PCM Connector C-52 [A/T].





1. Disconnect ECM connector C-51 [M/T] or PCM connector C-52 [A/T].
2. Pull out pin 18 to disconnect it.
3. Reconnect ECM connector C-51 [M/T] or PCM connector C-52 [A/T] with pin 18 still removed.
4. Turn the ignition switch to "ON" position.
- The radiator fan motor and condenser fan motor should operate.
If the radiator fan motor and condenser fan motor do not operate, replace the radiator fan motor and fan control module assembly. Then go to Step 12.
If radiator fan motor and condenser fan motor operate, replace the ECM [M/T] or PCM [A/T]. Then go to Step 12.

STEP 12. Check The Symptoms.
Confirm that the radiator fan and condenser fan operate correctly.


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