1. Remove the cooling fan motor connector.
2. Check that the cooling fan motor runs at low speed when a positive battery terminal is connected to the cooling fan motor-side connector terminal No.1, and terminal Nos.2 and 4 are grounded. Also check to see that there is no abnormal sound emitted from the cooling fan motor at this time.
3. Check that the cooling fan motor runs at high speed when a positive battery terminal is connected to the cooling fan motor-side connector terminal Nos.1 and 3, and terminal Nos.2 and 4 are grounded. Also check to see that there is no abnormal sound emitted from the cooling fan motor at this time.
4. If the cooling fan motor is defective, replace it (Refer to 
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