4-88 FI SYSTEM DIAGNOSIS
ACTIVE CONTROL INSPECTION
1) Set up the SDS tools. (
4-24 and refer to the SDS opera-
tion manual for further details.)
2) Start the engine and run it idling condition.
3) Click “Cooling fan relay control”
1
.
4) Click the “Operate”
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:
The cooling fan relay and cooling fan motor inspection is operational at any engine coolant temperature until
reaching 100 °C (212 °F).
5) Click the “Stop”
3
to check the operation properly.
6) Click the “Off”
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 reaches
each temp. of 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 ON.
* There is a tolerance of operating temperature of cooling fan relay.
