Component Test
COOLING FAN
Description
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
COOLING FAN MOTOR
The cooling fan operates at each speed when the current flows in the cooling fan motor as follows.
The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series under the middle speed condition.
Refer to "System Description" Except For Mexico.
Component Function Check
1. CHECK COOLING FAN LOW SPEED FUNCTION
With CONSULT
1.Turn ignition switch ON.
2.Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT and touch "LOW" on the CONSULT
screen.
3.Check that cooling fans operates at low speed.
Without CONSULT
1.Start engine and let it idle.
2.Turn air conditioner switch and blower fan switch ON.
3.Check that cooling fan operates at low speed.
Is the inspection result normal?
YES- GO TO 2.
NO- Check cooling fan low speed control circuit.
2. CHECK COOLING FAN HIGH SPEED FUNCTION
With CONSULT
1.Touch "HI" on the CONSULT screen.
2.Check that cooling fans operates at higher speed than low speed.
Without CONSULT
1.Turn ignition switch OFF.
2.Turn air conditioner switch and blower fan switch OFF.
3.Disconnect engine coolant temperature sensor harness connector.
4.Connect 150 ohms resistor to engine coolant temperature sensor harness connector.
5.Restart engine and check that cooling fan operates at higher speed than low speed.
Is the inspection result normal?
YES- INSPECTION END
NO- Check cooling fan high speed control circuit. Refer to "PROCEDURE B" in "Diagnosis Procedure".
Diagnosis Procedure
PROCEDURE A
1. CHECK GROUND CONNECTION
1.Turn ignition switch OFF.
2.Check ground connection E38. Refer to Ground Inspection in "Circuit Inspection" Circuit Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace ground connection.
2. CHECK COOLING FAN MOTORS POWER SUPPLY CIRCUIT-I
1.Disconnect cooling fan motor-2 harness connector.
2.Check the voltage between cooling fan motor-2 harness connectors and ground.
3.Also check harness for short to ground or short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
- 40 A fusible link (letter M)
- Harness for open or short between cooling fan motor-2 and battery
- Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK COOLING FAN MOTORS POWER SUPPLY CIRCUIT-II
1.Disconnect cooling fan relay-4.
2.Turn ignition switch ON.
3.Check the voltage between cooling fan relay-4 harness connectors and ground.
4.Also check harness for short to ground or short to power.
Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.
- IPDM E/R harness connector E14
- 15 A fuse (No. 63)
- Harness for open or short between cooling fan relay-4 and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK COOLING FAN MOTORS GROUND CIRCUIT FOR OPEN AND SHORT
1.Turn ignition switch OFF.
2.Disconnect cooling fan motor-1 harness connector.
3.Check the continuity between cooling fan motor-1 harness connectors and ground.
4.Also check harness for short to ground or short to power.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK COOLING FAN MOTORS CIRCUIT FOR OPEN AND SHORT
1.Disconnect IPDM E/R harness connector E13.
2.Check the continuity between cooling fan motor-2 harness connectors and cooling fan relay-4 harness connectors.
3.Check the continuity between cooling fan relay-4 harness connectors and cooling fan motor-1 harness connectors and ground.
4.Check the continuity between cooling fan relay-4 harness connectors and IPDM E/R harness connectors.
5.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK COOLING FAN RELAY-4
Refer to "Component Inspection (Cooling Fan Relay)" .
Is the inspection result normal?
YES- GO TO 9.
NO- Replace cooling fan relay.
9. CHECK COOLING FAN MOTORS
Refer to "Component Inspection (Cooling Fan Motor)" .
Is the inspection result normal?
YES- GO TO 10.
NO- Replace malfunctioning cooling fan motor. Refer to "Removal and Installation" Removal And Installation.
10. CHECK INTERMITTENT INCIDENT
Perform "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace IPDM E/R. Refer to ."Removal and Installation" Removal And Installation
NO- Repair or replace harness or connector.
PROCEDURE B
1. CHECK GROUND CONNECTION
1.Turn ignition switch OFF.
2.Check ground connection E21, E38. Refer to Ground Inspection in "Circuit Inspection" Circuit Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace ground connection.
2. CHECK IPDM E/R POWER SUPPLY AND GROUND CIRCUIT
Power supply and ground circuit. Refer to "Diagnosis Procedure" Testing and Inspection.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace malfunctioning part.
3. CHECK COOLING FAN MOTORS POWER SUPPLY CIRCUIT-I
1.Disconnect cooling fan motor-2 harness connector.
2.Check the voltage between cooling fan motor-2 harness connector and ground.
3.Also check harness for short to ground or short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the following.
- 40 A fusible link (letter M)
- Harness for open or short between cooling fan motor-2 and battery
- Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK COOLING FAN MOTORS POWER SUPPLY CIRCUIT-II
1.Disconnect cooling fan relay-5.
2.Turn ignition switch ON.
3.Check the voltage between cooling fan relay-5 harness connector and ground.
4.Also check harness for short to ground or short to power.
Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following.
- IPDM E/R harness connector E14
- 15 A fuse (No. 63)
- Harness for open or short between cooling fan relay-5 and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
7. CHECK COOLING FAN MOTORS GROUND CIRCUIT FOR OPEN AND SHORT
1.Turn ignition switch OFF.
2.Disconnect cooling fan motor-1 harness connector.
3.Check the continuity between cooling fan motor-1 harness connector and ground.
4.Check the continuity between cooling fan relay-5 harness connector and ground.
5.Also check harness for short to ground or short to power.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK COOLING FAN MOTORS CIRCUIT FOR OPEN AND SHORT
1.Disconnect IPDM E/R harness connector E15.
2.Check the continuity between cooling fan motor-2 harness connector and cooling fan relay-5 harness connector.
3.Check the continuity between cooling fan motor-2 harness connectors and IPDM E/R harness connectors.
4.Check the continuity between cooling fan relay-5 harness connectors and IPDM E/R harness connectors.
5.Check the continuity between cooling fan motor-1 harness connectors and IPDM E/R harness connectors.
6.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK COOLING FAN RELAY-5
Refer to "Component Inspection (Cooling Fan Relay)" .
Is the inspection result normal?
YES- GO TO 10.
NO- Replace cooling fan relay.
10. CHECK COOLING FAN MOTORS
Refer to "Component Inspection (Cooling Fan Motor)" .
Is the inspection result normal?
YES- GO TO 11.
NO- Replace malfunctioning cooling fan motor. Refer to "Removal and Installation" Removal And Installation.
11. CHECK INTERMITTENT INCIDENT
Perform "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace IPDM E/R. Refer to "Removal and Installation" Removal And Installation.
NO- Repair or replace harness or connector.
Component Inspection (Cooling Fan Motor)
1. CHECK COOLING FAN MOTORS
1.Turn ignition switch OFF.
2.Disconnect cooling fan motor-1 and -2 harness connectors E53, E54.
3.Supply cooling fan motor terminals with battery voltage and check operation.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace cooling fan motor. Refer to "Removal and Installation" Removal And Installation.
Component Inspection (Cooling Fan Relay)
1. CHECK COOLING FAN RELAYS
1.Turn ignition switch OFF.
2.Remove cooling fan relay.
3.Check the continuity between cooling fan relay terminals under the following conditions.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace cooling fan relay.