INSPECTION
| INSPECTION |
DETECTING CONDITION:
| • |
Engine coolant temperature is above 96°C
(205°F).
|
|
| • |
A/C compressor is rotated.
|
|
| • |
Vehicle speed is below 19 km/h
(12 MPH).
|
|
TROUBLE SYMPTOM:
| • |
Radiator sub fan does not rotate under the
above conditions.
|
|
| • |
Radiator sub fan does not rotate at
high speed when the following conditions are both met:
|
|
| 1. |
Engine coolant temperature is above 90°C
(194°F).
|
| 2. |
A/C is ON.
|
CHECK OPERATION OF RADIATOR.
Run the engine at idle. (Vehicle stationary)Turn the A/C switch to OFF.
Warm the engine coolant temperature over 96°C (205°F).
Does the radiator sub fan rotate?
| Yes |
| No |
CHECK OPERATION OF RADIATOR.
Turn the A/C switch to ON at condition of step 1.Does the radiator sub fan rotate faster when A/C compressor is operated?
| Yes |
Radiator main fan system is okay.
| No |
CHECK POWER SUPPLY TO SUB FAN MOTOR.
| Important | ||
|
Be careful not to overheat the engine during repair. |
||
Turn the ignition switch to OFF.
Disconnect the connector from sub fan motor.
Start the engine, and warm it up until engine coolant temperature increases over 96°C (205°F).
Stop the engine and turn ignition switch to ON.
Measure the voltage between sub fan motor connector and chassis ground.
Connector & terminal
(F16) No. 1 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK GROUND CIRCUIT OF SUB FAN MOTOR.
Turn the ignition switch to OFF.Measure the resistance between sub fan motor connector and chassis ground.
Connector & terminal
(F16) No. 3 — Chassis ground:
(F16) No. 4 — Chassis ground:
Is the resistance less than 5 Ω?
| Yes |
| No |
Repair the open circuit in harness between sub fan motor connector and chassis ground.
CHECK POOR CONTACT.
Check poor contact in sub fan motor connector.Is there poor contact in sub fan motor connector?
| Yes |
Repair the poor contact in sub fan motor connector.
| No |
CHECK MAIN FAN MOTOR.
Connect the battery positive (+) terminal to terminal No. 1, and ground (−) terminal to terminal No. 3 or No. 4 of sub fan motor connector.Does the main fan rotate?
| Yes |
Repair the poor contact in sub fan motor connector.
| No |
Replace the sub fan motor with a new one.
CHECK POWER SUPPLY TO SUB FAN RELAY1.
Turn the ignition switch to OFF.Remove the sub fan relay1 from A/C relay holder.
Measure the voltage between sub fan relay1 terminal and chassis ground.
Connector & terminal
(F27) No. 7 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK POWER SUPPLY TO SUB FAN RELAY1.
Turn the ignition switch to ON.Measure the voltage between sub fan relay1 terminal and chassis ground.
Connector & terminal
(F27) No. 5 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK 30 A FUSE.
Remove the 30 A fuse from A/C relay holder.Check the condition of fuse.
Is the fuse blown out?
| Yes |
Replace the fuse.
| No |
CHECK POWER SUPPLY TO A/C RELAY HOLDER 30 A FUSE TERMINAL.
Measure the voltage of harness between A/C relay holder 30 A fuse terminal and chassis ground.Connector & terminal
(F27) No. 3 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
Repair the open circuit in harness between 30 A fuse and sub fan relay terminal.
| No |
Repair the open circuit in harness between sub fuse box connector and 30 A fuse terminal.
CHECK FUSE.
Turn the ignition switch to OFF.Remove the fuse No. 17 from joint box.
Check the condition of fuse.
Is the fuse blown out?
| Yes |
Replace the fuse.
| No |
Repair the open circuit in harness between sub fan relay and ignition switch.
CHECK SUB FAN RELAY.
Turn the ignition switch to OFF.Remove the main fan relay1.
Measure the resistance of sub fan relay1.
Terminals
No. 7 — No. 8:
Is the resistance more than 1 MΩ?
| Yes |
| No |
Replace the sub fan relay.
CHECK SUB FAN RELAY.
Connect the battery to terminals No. 6 and No. 5 of sub fan relay1.Measure the resistance of sub fan relay.
Terminals
No. 7 — No. 8:
Is the resistance less than 1 Ω?
| Yes |
| No |
Replace the sub fan relay.
CHECK HARNESS BETWEEN SUB FAN RELAY TERMINAL AND SUB FAN MOTOR CONNECTOR.
Measure the resistance of harness between sub fan motor connector and sub fan relay terminal.Connector & terminal
(F16) No. 1 — (F27) No. 9:
Is the resistance less than 1 Ω?
| Yes |
| No |
Repair the open circuit in harness between sub fan motor connector and sub fan relay terminal.
CHECK HARNESS BETWEEN SUB FAN RELAY AND ECM.
Turn the ignition switch to OFF.Disconnect the connector from ECM.
Measure the resistance of harness between sub fan relay connector and ECM connector.
Connector & terminal
(F27) No. 7 — (B84) No. 17:
Is the resistance less than 1 Ω?
| Yes |
| No |
Repair the open circuit in harness between sub fan relay and ECM.
CHECK POOR CONTACT.
Check poor contact in connector between sub fan and ECM.Is there poor contact in connector between sub fan motor and ECM?
| Yes |
Repair the poor contact connector.
| No |
Record the DTC. Repair the trouble cause.
CHECK POWER SUPPLY TO SUB FAN MOTOR.
| Important | ||
|
Be careful not to overheat the engine during repair. |
||
Turn the ignition switch to OFF.
Disconnect the connector from sub fan motor.
Start the engine, and warm it up until engine coolant temperature increases over 96°C (205°F).
Turn the A/C switch ON.
Measure the voltage while A/C compressor is rotating.
Measure the voltage between sub fan motor connector and chassis ground.
Connector & terminal
(F16) No. 2 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK POOR CONTACT.
Check poor contact in sub fan motor connector.Is there poor contact in sub fan motor connector?
| Yes |
Repair the poor contact in sub fan motor connector.
| No |
CHECK SUB FAN MOTOR.
Connect the battery positive (+) terminal to terminal No. 2, and ground (−) terminal to terminal No. 3 or No. 4 of sub fan motor connector.Does the main fan rotate?
| Yes |
Repair the poor contact in sub fan motor connector.
| No |
Replace the sub fan motor with a new one.
CHECK POWER SUPPLY TO SUB FAN RELAY2.
Turn the ignition switch to OFF.Remove the sub fan relay2 from A/C relay holder.
Measure the voltage between sub fan relay2 terminal and chassis ground.
Connector & terminal
(F27) No. 21 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK POWER SUPPLY TO SUB FAN RELAY2.
Turn the ignition switch to ON.Measure the voltage between sub fan relay2 terminal and chassis ground.
Connector & terminal
(F27) No. 24 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
| No |
CHECK 30 A FUSE.
Remove the 30 A fuse from A/C relay holder.Check the condition of fuse.
Is the fuse blown out?
| Yes |
Replace the fuse.
| No |
CHECK POWER SUPPLY TO A/C RELAY HOLDER 30 A FUSE TERMINAL.
Measure the voltage of harness between A/C relay holder 30 A fuse terminal and chassis ground.Connector & terminal
(F27) No. 3 (+) — Chassis ground (−):
Is the voltage more than 10 V?
| Yes |
Repair the open circuit in harness between 30 A fuse and sub fan relay terminal.
| No |
Repair the open circuit in harness between sub fuse box connector and 30 A fuse terminal.
CHECK FUSE.
Turn the ignition switch to OFF.Remove the fuse No. 17 from joint box.
Check the condition of fuse.
Is the fuse blown out?
| Yes |
Replace the fuse.
| No |
Repair the open circuit in harness between sub fan relay and ignition switch.
CHECK SUB FAN RELAY.
Turn the ignition switch to OFF.Remove the sub fan relay2.
Measure the resistance of main fan relay2.
Terminals
No. 20 — No. 21:
Is the resistance more than 1 MΩ?
| Yes |
| No |
Replace the sub fan relay.
CHECK MAIN FAN RELAY.
Connect the battery to terminals No. 19 and No. 20 of sub fan relay2.Measure the resistance of main fan relay2.
Terminals
No. 20 — No. 21:
Is the resistance less than 1 Ω?
| Yes |
| No |
Replace the sub fan relay.
CHECK HARNESS BETWEEN SUB FAN RELAY TERMINAL AND SUB FAN MOTOR CONNECTOR.
Measure the resistance of harness between sub fan motor connector and sub fan relay2 terminal.Connector & terminal
(F16) No. 2 — (F27) No. 20:
Is the resistance less than 1 Ω?
| Yes |
| No |
Repair the open circuit in harness between sub fan motor connector and sub fan relay terminal.
CHECK HARNESS BETWEEN SUB FAN RELAY AND ECM.
Turn the ignition switch to OFF.Disconnect the connector from ECM.
Measure the resistance of harness between sub fan relay connector and ECM connector.
Connector & terminal
(F27) No. 22 — (B84) No. 28:
Is the resistance less than 1 Ω?
| Yes |
| No |
Repair the open circuit in harness between sub fan relay and ECM.
CHECK POOR CONTACT.
Check poor contact in connector between sub fan and ECM.Is there poor contact in connector between sub fan motor and ECM?
| Yes |
Repair the poor contact connector.
| No |
Record the DTC. Repair the trouble cause.
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