Radiator Cooling Fan: Testing and Inspection

COOLING FAN





Description

COOLING FAN CONTROL MODULE
Cooling fan control module receives ON/OFF pulse duty signal from IPDM E/R. Corresponding to this ON/OFF pulse duty signal, cooling fan control module sends cooling fan motor operating voltage to cooling fan motor.
The revolution speed of cooling fan motor is controlled by duty cycle of the voltage.

COOLING FAN MOTOR
Cooling fan motor receives cooling fan motor operating voltage from cooling fan control module. The revolution speed of cooling fan motor is controlled by duty cycle of the voltage.




Component Function Check
1.CHECK COOLING FAN FUNCTION
With CONSULT-III
1. Turn ignition switch ON.
2. Perform "FAN DUTY CONTROL" in "ACTIVE TEST" mode with CONSULT-III.
3. Make sure that cooling fan speed varies according to the percent.
Without CONSULT-III
1. Perform IPDM E/R auto active test and check cooling fan motors operation, Diagnosis Description.
2. Make sure that cooling fan operates.
Is the inspection result normal?
YES - INSPECTION END
NO - Go to SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect cooling fan control module harness connector E231.
3. Turn ignition switch ON.





4. Check the voltage between cooling fan control module harness connector and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 7.
2.CHECK COOLING FAN CONTROL MODULE GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check the continuity between cooling fan control module harness connector and ground.





3. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 3.
NO - Repair open circuit or short to power in harness or connectors.
3.CHECK IPDM E/R GROUND CIRCUIT
1. Disconnect IPDM E/R harness connectors E17, E18.
2. Check the continuity between IPDM E/R harness connector and ground.





3. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair open circuit or short to power in harness or connectors.
4.CHECK COOLING FAN CONTROL SIGNAL CIRCUIT
1. Disconnect IPDM E/R harness connector E201.
2. Check the continuity between IPDM E/R harness connector and cooling fan control module harness connector.





3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 5.
NO - Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK COOLING FAN CONTROL MODULE OUTPUT SIGNAL CIRCUIT
1. Reconnect all harness connectors disconnected.
2. Disconnect cooling fan control module harness connectors E232, E233.
3. Turn ignition switch ON.





4. Check the voltage between cooling fan control module harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - Replace cooling fan control module. Service and Repair.
6.CHECK COOLING FAN MOTORS -1 AND -2
SEE Component Inspection (Cooling Fan Motor).
Is the inspection result normal?
YES - GO TO 11.
NO - Replace cooling fan motor. Service and Repair.
7.CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect cooling fan relay harness connector E82.
3. Turn ignition switch ON.





4. Check the voltage between cooling fan relay harness connector and ground.





Is the inspection result normal?
YES - GO TO 9.
NO - GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
- IPDM E/R harness connector E18
- 50A fusible link (letter O)
- Harness for open or short between cooling fan relay-1 and fuse
- Harness for open or short between cooling fan relay-1 and IPDM E/R
- Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E17.
3. Check the continuity between cooling fan relay-1 harness connector and IPDM E/R harness connector.





4. Check the continuity between cooling fan relay harness connector and cooling fan control module harness connector.





5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 11.
NO - GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
- Harness connector E81, E207
- Harness for open or short between cooling fan relay-1 and cooling fan control module
- Repair open circuit or short to ground or short to power in harness or connectors.
11.CHECK COOLING FAN RELAY-1
SEE Component Inspection (Cooling Fan Relay).
Is the inspection result normal?
YES - GO TO 12.
NO - Replace cooling fan relay-1. For the relay number, [1][2]Electrical Diagrams. For the relay arrangement, Harness Locations.
12.CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident.
Is the inspection result normal?
YES - Replace IPDM E/R. Service and Repair.
NO - Repair or replace harness connectors.




Component Inspection (Cooling Fan Motor)
1.CHECK COOLING FAN MOTOR
1. Turn ignition switch OFF.
2. Disconnect cooling fan control module harness connectors E232, E233.
3. Supply cooling fan control module terminals with battery voltage and check operation.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace cooling fan motor. Service and Repair.




Component Inspection (Cooling Fan Relay)
1.CHECK COOLING FAN RELAY-1
1. Turn ignition switch OFF.
2. Remove cooling fan relay-1. For the relay number, [1][2]Electrical Diagrams. For the relay arrangement, Harness Locations.





3. Check the continuity between cooling fan relay-1 terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace cooling fan relay. For the relay number, [1][2]Electrical Diagrams. For the relay arrangement,
Harness Locations.