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4-104 FI SYSTEM DIAGNOSIS
ACTIVE CONTROL INSPECTION
1) Set up the SDS tool. (Refer to the SDS operation manual for
further details.)
2) Start the engine and run it idling condition.
3) Click “Cooling fan relay control” 1.
4) Click the operate button 2.
At this time, if an operation sound is heard from the cooling fan relay and cooling fan motor is operated,
the function is normal.
NOTE:
Cooling fan relay and cooling fan motor operation can be checked until the engine coolant temperature is
less than 100 °C (212 °F) after starting the engine.
5) Click the stop button 3 to check the operation properly.
6) Click the off button 4 to check the cooling fan relay and cooling fan motor operation.
NOTE:
This inspection should be begun from when the engine coolant temperature is below 50 °C (122 °F).
Check that the cooling fan relay operates for a few seconds as the engine coolant temperature arrives each
at 50 °C (122 °F), 70 °C (158 °F) and 90 °C (194 °F)/above 4 000 r/min. It is cooling fan motor malfunction or
its circuit failure when the motor would not run even if the relay turns to ON.
NOTE:
There is a tolerance of operating temperature of cooling fan relay.