If simulation function of WDS or equivalent is not used:

Connect the WDS or equivalent to DLC-2.
Start the engine and warm it up to normal operating temperature.
Perform the KOER self-test. (See KOEO/KOER SELF TEST .)
Verify that the DTC P0480, P0481 or P0482 is not shown and cooling fan operating while the KOER self-test.
- If the DTC P0480 is shown, perform the DTC troubleshooting procedure. (See DTC P0480 .) (See DTC P0481 .) (See DTC P0482 .)
- If the cooling fans do not operate while KOER self-test, proceed the followings:
1. Inspect the cooling fan motor and wiring harness between cooling fan motor and GND.
2. Turn the ignition switch to off.
3. Disconnect ECT sensor connector.
4. Verify that the operation sound heard form all cooling fan relays (No.1, No.2 and No.3), when the ignition switch to ON position.
  - If the operation sound is not heard, inspect for suspected cooling fan relay is stuck open or close.
  - If the operation sound is heard, inspect wiring harness and connector between all cooling fan relays and cooling fan motor.
5. Turn the ignition switch off and disconnect the ECT sensor connector.
6. Reconnect the ECT sensor and clear the DTC from PCM memory using the WDS or equivalent.