Cooling Fans - Except Evolution & Sportback Mitsubishi Lancer Evolution VIII

DESCRIPTION & OPERATION

The fan control module is powered from fusible link No. 2. (Scheme 1) The ECM (manual transmission) or PCM (automatic transmission) judges the required revolution speed of radiator fan motor and condenser fan motor using input signals transmitted from the A/C switch, automatic compressor controller, vehicle speed sensor and engine coolant temperature sensor. The ECM or PCM activates the fan control module to drive the radiator fan motor and condenser fan motor.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

Scheme 1

TROUBLE SHOOTING

Note. To trouble shoot mechanical cooling system components, see appropriate table in TROUBLE SHOOTING article in GENERAL INFORMATION.

CONDENSER FAN MOTOR

Remove the condenser fan motor connector. Connect battery voltage to terminal No. 2 and ground terminal No. 1 and see if condenser fan operates. (Scheme 2) Also check that there is not abnormal sounds coming from the condenser fan motor. If condenser fan motor is defective, replace it.

Scheme 2

FAN CONTROL MODULE

1. Remove the fan control module connector. (Scheme 7)
2. Turn the ignition switch to the ON position. Check for battery voltage between terminals No. 1 and 3.
3. Reconnect the fan control module connector and disconnect the condenser fan motor connector. (Scheme 3)
4. Measure voltage between the fan control module (side connector) terminals. Voltage should be 1V or less.
5. Turn the A/C switch to the ON position.
6. Measure the voltage between the fan control module (side connector) terminals while the fan is running. The voltage should repeat values 5.6-10.8V and battery voltage.
7. If the voltage does not repeatedly change as indicated, replace the fan control module.

Scheme 3

Scheme 4

Scheme 5

RADIATOR FAN MOTOR

Remove the radiator fan motor connector. Connect battery voltage to terminal No. 1 and ground terminal No. 2 and see if radiator fan operates. (Scheme 6) Also check that there are not abnormal sounds coming from the radiator fan motor. If radiator fan motor is defective, replace it.

Scheme 6

SYMPTOM TESTS

RADIATOR FAN & CONDENSER FAN SYMPTOMS

Technical Description

1. The cause could be a malfunction of the fan control module power supply or ground circuit.
2. The cause could also be a malfunction of the fan control module of the ECM (manual transmission) or PCM (automatic transmission).

Troubleshooting Hints

1. Malfunction of fusible link.
2. Malfunction of fan control relay.
3. Malfunction of MFI relay.
4. Malfunction of radiator fan motor.
5. Malfunction of condenser fan motor.
6. Malfunction of fan control module.
7. Malfunction of ECM (manual transmission) or PCM (automatic transmission).
8. Damaged wiring harness or connector.

Diagnosis

1. Disconnect fan control module connector A-17. (Scheme 7) Measure for voltage between terminal No. 3 (component side of the connector) and ground when ignition switch is turned to the ON position. If battery voltage is not achieved, go to next step. If battery voltage is achieved, go to step 8.
2. Check fan control relay. See «FAN CONTROL RELAY»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) under COMPONENTS TESTS. If fan control relay is okay, go to next step. If fan control relay is not okay, replace it and retest.
3. Check the MFI relay. See «MULTI-PORT FUEL INJECTION (MFI) RELAY»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) under COMPONENT TESTS. If MFI relay is okay, go to next step. If MFI relay is not okay, replace it and retest.
4. Check for harness damage in Black/White wire between fusible link No. 2 and terminal No. 4 of fan control relay connector A-09X. (Scheme 8) If wire is okay, go to next step. If wire is damaged, repair or replace as necessary and retest.
5. Check for harness damage in Blue wire between terminal No. 2 of fan control relay connector A-09X and terminal No. 3 of fan control module connector A-17. (Scheme 7)and (Scheme 8). If wire is okay, go to next step. If wire is damaged, repair or replace as necessary and retest.
6. Check for harness in damage in Red/Yellow wire between terminal No. 4 of MFI relay connector B-16X and terminal No. 1 of fan control relay connector A-09X. (Scheme 8)and (Scheme 11). If wire is okay go to next step. Of wire is damaged, repair or replace as necessary and retest.
7. Check for harness damage between terminal No. 3 of fan control relay connector A-09X and ground. (Scheme 8) If wire is damaged, repair it and retest.
8. Disconnect fan control module connector A-17. (Scheme 7) Measure resistance between terminal No. 1 (harness side of connector) and ground. If the resistance is more than 2 ohms, go to next step. If resistance is less than 2 ohms, go to step 10.
9. Check the harness wires between fan control module connector A-17 and ground. If harness wires are okay go to next step. If harness wires are damaged, repair as necessary and retest.
10. Start the engine and allow it to idle. Measure the output circuit voltage between identified ECM or PCM terminals and ground by backprobing. See «OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) table. (Scheme 12) If the voltage when the radiator fan is operating is less than 0.7V, go to next step. If the voltage when the radiator fan is operating is more than 0.7V, go to step 12.
11. Check the harness wire between identified ECM or PCM terminals and terminal No. 2 of fan control module connector A-17. See «OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) table. (Scheme 7)and (Scheme 12). If wiring is damaged repair or replace as necessary and retest. If wiring is okay, go to next step.
12. Disconnect ECM or PCM connector. Turn the ignition switch to the ON position. If the radiator fan motor and condenser fan motor operate, replace the ECM or PCM and retest. If the radiator fan motor and condenser fan motor do not operate, replace the fan control module and retest.

OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

TEST B: RADIATOR FAN & CONDENSER FAN DO NOT CHANGE SPEED OR STOP

Note. If the engine coolant temperature reaches 230°F (110°C) or higher, the radiator fan control runs the radiator fan for up to 5 minutes even after the ignition switch is turned to the LOCK position. The fan stops its rotation when the engine coolant temperature decreases to 230°F (110°C) or lower.

The fan control module has variable control of the radiator fan motor and the condenser fan motor speeds using signals transmitted from the ECM (vehicles with manual transmission) or PCM (vehicles with automatic transmission).

1. Malfunction of fan control relay.
2. Malfunction of fan control module.
3. Malfunction of ECM (vehicles with manual transmission) or PCM (vehicles with automatic transmission).

1. Check the fan control relay. See «FAN CONTROL RELAY»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) under COMPONENT TESTS. If fan control relay is okay, go to next step. If fan control module is damaged, repair or replace as necessary and retest.
2. Check the harness wire between terminal No. 2 of fan control relay connector A-09X and terminal No. 3 of fan control module connector A-17. (Scheme 7)and (Scheme 8). If wiring is damaged, repair or replace as necessary and retest. If wiring is okay, go to next step.
3. Start the engine and allow it to idle. Measure the output circuit voltage between identified ECM or PCM terminals and ground by backprobing. See «OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) table. (Scheme 12) If the voltage when the radiator fan is not operating is more than 0.3V, go to next step. If the voltage when the radiator fan is not operating is less than 0.3V, retest.
4. Check the harness wire between identified ECM or PCM terminals and terminal No. 2 of fan control module connector A-17. See «OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) table. (Scheme 7)and (Scheme 12). If wiring is damaged repair or replace as necessary and retest. If wiring is okay, go to next step.
5. Disconnect ECM or PCM connector. Pull out identifed ECM or PCM pin and connect it to a body ground. See «OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) table. (Scheme 12) Reconnect ECM or PCM connector with identified pin still removed. See «OUTPUT CIRCUIT VOLTAGE TERMINAL IDENTIFICATION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback) table. Turn the ignition switch to ON position. If the radiator fan motor and condenser fan motor fan motor stop operating, replace the ECM or PCM and retest. If the radiator fan motor and condenser fan motor do not stop operating, replace the fan control module and retest.

The cause could be a malfunction of the radiator fan motor or an open circuit between the fan control module and the radiator fan.

1. Malfunction of radiator fan motor.
2. Malfunction of fan control module.

1. Check the radiator fan motor. See «RADIATOR FAN MOTOR»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback__radiator-fan-motor) under COMPONENT TESTS. If radiator fan motor is okay, go to next step. If radiator fan motor is not okay, replace radiator fan motor and retest.
2. Check the fan control module. See «FAN CONTROL MODULE»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback__fan-control-module) under COMPONENT TESTS. If fan control module is okay, retest. If fan control module is not okay, replace fan control module and retest.

The cause could be a malfunction of the condenser fan motor or an open circuit between the fan control module and the radiator fan.

1. Malfunction of condenser fan motor.
2. Malfunction of fan control module.

1. Check the condenser fan motor. See «CONDENSER FAN MOTOR»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback__condenser-fan-motor) under COMPONENT TESTS. If condenser fan motor is okay, go to next step. If radiator fan motor is not okay, replace radiator fan motor and retest.
2. Check the fan control module. See «FAN CONTROL MODULE»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/cooling-fan/#cooling-fans-except-evolution-sportback__fan-control-module) under COMPONENT TESTS. If fan control module is okay, retest. If fan control module is not okay, replace fan control module and retest.

Removal & Installation

1. Drain engine coolant.
2. Remove condenser fan. (Scheme 13)or (Scheme 14).
3. Remove heat protector.
4. Remove condenser fan motor.
5. Remove fan control module.
6. Remove radiator fan.
7. Remove radiator fan motor.
8. Remove fan shroud.
9. To install, reverse removal procedures.

Scheme 13

Scheme 14

WIRING DIAGRAMS

See COOLING FAN in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

See also:
• A
• B
• RADIATOR FAN MOTOR
• FAN CONTROL MODULE
• CONDENSER FAN MOTOR