Cooling Fan Control System Inspection

Connect the M-MDS to the 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 P0480:00 or P0481:00 is not shown and the cooling fan operates during the KOER self test.
- If DTC P0480:00 or P0481:00 is shown, perform the DTC troubleshooting procedure. (See DTC P0480:00 .) (See DTC P0481:00 .)
- If the cooling fans do not operate, proceed to the following:
1. Verify the clicking sound of the cooling fan relay when the ignition switch is turned from the off to the ON position.
2. If there is no the clicking sound, inspect for followings:
  - Cooling fan relay (stuck open)
  - Open circuit in wiring harness between main relay and cooling fan relay
  - Open circuit in wiring harness between PCM terminal 1AO and cooling fan relay
3. If there is a clicking sound, inspect the following parts in the indicated order in accordance with fan operation conditions.
  Both cooling fans do not operate
  - Open circuit between the fan control module and the cooling fan relay
  - Open circuit between fan control module and ground
  - Poor connection of the fan control module connector
  - Fan control module (See FAN CONTROL MODULE INSPECTION .)
    Cooling fan motor No.1 does not operate
  - Open or short to ground circuit between the fan control module No.1 and cooling fan motor No.1
  - Poor connection of the fan control module No.1 connector or cooling fan motor No.1 connector
  - Cooling fan motor No.1 (See FAN MOTOR INSPECTION .)
  - Fan control module No.1 (See FAN CONTROL MODULE INSPECTION .)
    Cooling fan motor No.2 does not operate
  - Open or short to ground circuit between the fan control module No.2 and the cooling fan motor No.2
  - Poor connection of the fan control module No.2 connector or the cooling fan motor No.2 connector
  - Cooling fan motor No.2 (See FAN MOTOR INSPECTION .)
  - Fan control module No.2 (See FAN CONTROL MODULE INSPECTION .)