Cooling Fan
COOLING FAN
Component Function Check
1. CHECK COOLING FAN FUNCTION
WITH CONSULT
1.Turn power switch ON.
2.Perform "COOLING FAN" in "ACTIVE TEST" mode with CONSULT.
3.Check that cooling fan speed varies according to the percentage.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .
Diagnosis Procedure
1. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY
1.Turn power switch OFF.
2.Disconnect cooling fan control module harness connector.
3.Turn power switch ON.
4.Check the voltage between cooling fan control module harness connector and ground.
Is the inspection result normal?
YES- GO TO 11.
NO- GO TO 2.
2. CHECK 12V BATTERY POWER SUPPLY
1.Turn power switch OFF.
2.Remove cooling fan relay.
3.Check the voltage between cooling fan relay harness connector and ground.
Is the inspection result normal?
YES- GO TO 3.
NO- Check power supply circuit for battery power supply.
3. CHECK M/C RELAY OUTPUT VOLTAGE-I
1.Turn power switch ON.
2.Check the voltage between cooling fan relay harness connector and ground.
Is the inspection result normal?
YES- GO TO 8.
NO- GO TO 4.
4. CHECK FUSE
1.Turn power switch OFF.
2.Pull out #73 fuse.
3.Check that the fuse is not fusing.
Is the inspection result normal?
YES- GO TO 5.
NO- Replace the fuse after repairing the applicable circuit.
5. CHECK M/C RELAY OUTPUT VOLTAGE-II
1.Turn power switch ON.
2.Check the voltage between fuse harness connector and ground.
Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 6.
6. CHECK M/C RELAY OUTPUT CIRCUIT
1.Turn power switch OFF.
2.Remove M/C relay.
3.Check the continuity between M/C relay harness connector terminal and fuse harness connector.
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- Check M/C relay routing circuit. Refer to "Diagnosis Procedure" M/C Relay.
NO- Repair or replace error-detected parts.
7. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT
1.Turn power switch OFF.
2.Check the continuity between cooling fan relay harness connector and fuse terminal.
3.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Repair or replace error-detected parts.
8. CHECK COOLING FAN RELAY GROUND CIRCUIT
1.Turn power switch OFF.
2.Check the continuity between cooling fan relay harness connector and ground.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace error-detected parts.
9. CHECK COOLING FAN CONTROL MODULE INPUT POWER VOLTAGE
1.Check the continuity between cooling fan relay harness connector and cooling fan control module harness connector.
Is the inspection result normal?
YES- GO TO 10.
NO- Repair or replace error-detected parts.
10. CHECK COOLING FAN RELAY
Refer to "Component Inspection (Cooling Fan Relay)" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace cooling fan relay.
11. CHECK COOLING FAN RELAY GROUND CIRCUIT
1.Turn power switch OFF.
2.Check the continuity between cooling fan control module harness connector and ground.
Is the inspection result normal?
YES- GO TO 12.
NO- Repair or replace error-detected parts.
12. CHECK COOLING FAN MOTOR 1 AND 2
Check cooling fan motor. Refer to "Component Inspection (Cooling Fan Motor)" .
Is the inspection result normal?
YES- GO TO 13.
NO- Replace malfunctioning cooling fan motor. Refer to "Exploded View" Exploded View.
13. CHECK COOLING FAN CONTROL SIGNAL CIRCUIT
1.Disconnect VCM harness connector.
2.Check the continuity between cooling fan control module harness connector and VCM harness connector.
3.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 14.
NO- Repair or replace error-detected parts.
14. REPLACE COOLING FAN CONTROL MODULE
1.Replace cooling fan control module. Refer to "Exploded View" Exploded View.
2.Erase the DTC.
3.Perform component function check. Refer to "Component Function Check" .
Is the inspection result normal?
YES- INSPECTION END
NO- Replace VCM. Refer to "Removal and Installation" Removal And Installation.
Component Inspection (Cooling Fan Motor)
1. CHECK COOLING FAN MOTOR
1.Turn power switch OFF.
2.Disconnect cooling fan control module harness connectors.
3.Supply cooling fan control module harness connector terminals with 12V battery voltage as per the following, and check operation.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace malfunctioning cooling fan motor. Refer to "Exploded View" Exploded View.
Component Inspection (Cooling Fan Relay)
1. CHECK COOLING FAN RELAY
1.Turn power 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.