P0483

DTC P0483 - COOLING FAN RATIONALITY CHECK

OUTLINE OF DIAGNOSIS
Detect the malfunction of radiator fun.
Judge NG when the engine coolant temperature decreases slowly even if the radiator fan started rotating.




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously when the engine coolant temperature is very high (more than 100 °C (212 °F)).

DIAGNOSTIC METHOD




Check the engine coolant temperature (A/D value) when the radiator fan is ON since the radiator fan output turns from OFF to ON with all of the malfunction conditions completed.







Judge NG when the cumulative time until completing the malfunction criteria becomes more than the time (5 minutes) needed for diagnosis. Also Judge OK when the malfunction criteria is not completed. And then clear NG.

Time Needed for Diagnosis: 5 minutes
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

DTC CLEAR METHOD
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed

FAIL SAFE
None

ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)