Radiator Cooling Fan: Testing and Inspection

Cooling Fan Control System Inspection
1. Connect the M-MDS to the DLC-2.
2. Start the engine and warm it up to normal operating temperature.
3. Perform the KOER self-test. (See KOEO/KOER SELF TEST[L3 WITH TC).) KOEO/KOER Self Test
4. Verify that the DTC P0480 is not shown and the cooling fan operates during the KOER self-test.
- If DTC P0480 is shown, perform the DTC troubleshooting procedure. (See DTC P0480[L3 WITH TC].)
- 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 the cooling fan relay for an open circuit between the ignition switch and the cooling fan relay.
- If there is a clicking sound, go to the next step.
- Inspect the following parts in the indicated order in accordance with fan operation conditions.

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[L3 WITH TC].)

Cooling fan motor No.1 does not operate
- Open or short to ground circuit between the fan control module and cooling fan motor No.1
- Poor connection of the fan control module connector or cooling fan motor No.1 connector
- Cooling fan motor No.1 (See FAN MOTOR INSPECTION[L3 WITH TC].)
- Fan control module (See FAN CONTROL MODULE INSPECTION[L3 WITH TC].)

Cooling fan motor No.2 does not operate
- Open or short to ground circuit between the fan control module and the cooling fan motor No.2
- Poor connection of the fan control module connector or the cooling fan motor No.1 connector
- Cooling fan motor No.2 (See FAN MOTOR INSPECTION[L3 WITH TC].)
- Fan control module (See FAN CONTROL MODULE INSPECTION[L3 WITH TC].)