Radiator Main Fan Hi Mode With AC

C: HI MODE OPERATION (WITH A/C MODEL)
DETECTING CONDITION:
Condition (1):
- Engine coolant temperature is below 89°C (192°F).
- A/C switch is turned ON.
Vehicle speed is over 20 km/h (12 MPH).

Condition (2):
- Engine coolant temperature is above 95°C (203° F).
- A/C switch is turned OFF.
- Vehicle speed is over 20 km/h (12 MPH).

Condition (3):
- Engine coolant temperature is above 95°C (203° F).
- A/C switch is turned ON.

TROUBLE SYMPTOM:
- Radiator main fan does not rotate at HI speed.

1) Start the engine, and warm-up it until engine coolant temperature increases over 95°C (203°F).
2) Stop the engine and turn ignition switch to ON.
3) Turn A/C switch to OFF.
(CHECK) Does the main fan operate at LO MODE?
(YES) Go to step 1C2.
(NO) Go to LO MODE OPERATION diagnostics chart. Radiator Main Fan LO Mode with AC

1C2: CHECK POWER SUPPLY TO MAIN FAN MOTOR.


CAUTION: Be careful not to overheat engine during repair.

1) Turn ignition switch to OFF.
2) Disconnect connector from main tan motor.
3) Warm-up the engine until engine coolant temperature increases over 95°C (203°F).
4) Stop the engine and turn ignition switch to ON.
5) Turn A/C switch to ON.
6) Measure voltage between main fan motor connector and chassis ground.
Connector & terminal
(F17) No.3 (+) - Chassis ground (-):






(CHECK) Is voltage more than 10 V?
(YES) Go to step 1C3.
(NO) Go to step 1C4.


1C3: CHECK MAIN FAN MOTOR.
1) Turn ignition switch and A/C switch to OFF.
2) Connect battery positive (+) terminal to terminals No.2 and No.3 of main fan motor connector, and negative (-) terminal to terminal No.1.






(CHECK) Does the main fan rotate at HI speed?
(YES) Repair poor contact in main fan motor connector.
(NO) Replace main fan motor with a new one.

1C4: CHECK POWER SUPPLY TO MAIN FAN RELAY-2.
1) Turn ignition switch and A/C switch to OFF.
2) Remove main fan relay-2 from A/C relay holder.
3) Measure voltage between main tan relay-2 terminal and chassis ground.
Connector & terminal
(F30) No.2 (+) - Chassis ground (-):






(CHECK) Is voltage more than 10 V?
(YES) Go to step 1C5.
(NO)Go to step 1C6.

1C5: CHECK POWER SUPPLY TO MAIN FAN RELAY-2.
1) Turn ignition switch to ON.
2) Measure voltage between main {an relay-2 terminal and chassis ground.
Connector & terminal
(F30) No. 1 (+) - Chassis ground (-):






(CHECK) Is voltage more than 10 V?
(YES) Go to step 1C8.
(NO) Go to step 1C7.

1C6: CHECK HARNESS CONNECTOR BETWEEN 20 A FUSE AND MAIN FAN RELAY-2 IN NC RELAY HOLDER.
1) Turn ignition switch to OFF.
2) Remove 20 A fuse from A/C relay holder.
3) Measure resistance of harness between 20 A fuse and main fan relay-2 terminal.
Connector & terminal (F27) No.2 (F30) No.2:






(CHECK) Is resistance less than 1 ohm?
(YES) Repair poor contact in main tan relay-2 connector.
(NO) Repair open circuit in harness between 20 A fuse and main fan relay-2 connector.

1C7: CHECK HARNESS CONNECTOR BETWEEN 10 A FUSE AND MAIN FAN RELAY-2 IN A/C RELAY HOLDER.
1) Turn ignition switch to OFF.
2) Remove 10 A fuse from A/C relay holder.
3) Measure resistance of harness between 10A fuse and main fan relay-2 terminal.
Connector & terminal
(F27) No.4 - (F30) No.1:






(CHECK) Is resistance less than 1 ohm?
(YES) Repair poor contact in main fan relay-2 connector.
(NO) Repair open circuit in harness between 10 A fuse and main fan relay-2 connector.

1C8:CHECK MAIN FAN RELAY-2.
1) Turn ignition switch to OFF.
2) Check continuity between main fan relay-2 terminals.






(CHECK) Does continuity exist between terminals No. 2 and No.4?
(YES) Replace main fan relay-2.
(NO) Go to step 1C9.
1C9:CHECK MAIN FAN RELAY-2.
1) Connect battery to terminals No.1 and No.3 of main fan relay-2.
2) Check continuity between main fan relay-2 terminals.






(CHECK) Does continuity exist between terminals No. 2 and No.4?
(YES) Go to step 1C1O.
(NO) Replace main fan relay-2.

1C1O: CHECK HARNESS CONNECTOR BETWEEN MAIN FAN RELAY-2 AND MAIN FAN MOTOR.
Measure resistance of harness between main fan motor connector and main fan relay-2 terminal.
Connector & terminal
(F17) No.3 - (F30) No.4:






(CHECK) Is resistance less than 1 ohm?
(YES) Go to step 1C11.
(NO) Repair open circuit in harness between main tan motor and main fan relay-2 connector.

1C11 : CHECK POOR CONTACT.
Check poor contact in main fan relay-2 connector.
(CHECK) Is there poor contact in main fan relay-2 connector?
(YES) Repair poor contact in main fan relay-2 connector.
Go to step 1C12.

1C12: CHECK POOR CONTACT.
Check poor contact in main fan motor connector.
(CHECK) Is there poor contact in main fan motor connector?
(YES) Repair poor contact in main fan motor connector.
Refer to"On-Board Diagnostics II System" diagnostics procedure.