Radiator Cooling Fan: Testing and Inspection

COOLING FAN

Component Function Check


1. CHECK COOLING FAN FUNCTION

With CONSULT
1.Turn ignition switch ON.
2.Perform "COOLING FAN" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
3.Touch "LOW", "MID", "HI" on the CONSULT screen.
4.Check that cooling fan operates.
Without CONSULT
1.Activates IPDM E/R auto active test and check cooling fan motors operation, refer to {LINK_TO:0000000007986567}, "Diagnosis
Description".
2.Check that cooling fan operates.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect cooling fan relays-2, -3.
3.Turn ignition switch ON.





4.Check the voltage between cooling fan relays-2, -3 harness connectors and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- Perform trouble diagnosis for power supply circuit.

2. CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect IPDM E/R harness connectors.
3.Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connector.





4.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace error-detected parts.

3. CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT

1.Disconnect cooling fan motor-1 harness connector.





2.Check the voltage between cooling fan motor-1 harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Perform trouble diagnosis for power supply circuit.

4. CHECK COOLING FAN MOTOR CIRCUIT-1

1.Disconnect cooling fan motor-2 harness connector.
2.Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 harness connectors.





3.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

5. CHECK COOLING FAN MOTOR CIRCUIT-2

1.Check the continuity between IPDM E/R harness connector and cooling fan motor-1, -2 harness connector.





2.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace error-detected parts.

6. CHECK COOLING FAN MOTOR CIRCUIT-3

1.Check the continuity between cooling fan relay-2, -3 harness connectors and ground.





2.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace error-detected parts.

7. CHECK COOLING FAN MOTOR CIRCUIT-4

1.Check the continuity between cooling fan motor-2 harness connector and ground.





2.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace error-detected parts.

8. CHECK COOLING FAN RELAY-2 AND -3

Refer to "Component Inspection (Cooling Fan Relay)" .
Is the inspection result normal?
YES- GO TO 9.
NO- Replace malfunctioning cooling fan relay.

9. CHECK COOLING FAN MOTORS-1 AND -2

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" Service and Repair.
NO- Repair or replace error-detected parts.


Component Inspection (Cooling Fan Motor)


1. CHECK COOLING FAN MOTOR

1.Turn ignition switch OFF.
2.Disconnect cooling fan motor harness connector.





3.Supply cooling fan motor terminals with battery voltage and check operation.





Check that cooling fan speed of condition B is higher than that of A.
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-2, -3.





3.Check the continuity between cooling fan relay-2, -3 terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace cooling fan relay.