GS 300 RWD V6-3.0L (3GR-FSE) (2006)
Radiator Cooling Fan Control Module: Testing and Inspection
COOLING FAN ECU
ON-VEHICLE INSPECTION
1. CHECK COOLING FAN ECU
a. Inspect the input voltage.
(1) Disconnect the cooling fan ECU connector.
(2) Turn the engine switch on (IG). Check the voltage of the 3 (+B1) terminal of the wire harness side connector.
Standard voltage: 9 to 14 V
If the result is not as specified, inspect the power source system (fusible link, fuse, wire harness and relay).
b. Inspect the cooling fan motor.
c. Check the resistance of the wire harness side connector between terminals ECM (RFC) and cooling fan ECU (SI).
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If the fan does not operate, there may be a short circuit.
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If the fan remains operating, there may be an open circuit.
d. Inspect the ECM power source circuit and ground circuit.
e. Inspect the input signal and output current.
HINT: Be sure to perform the inspection with the radiator coolant temperature less than 82°C (180°F).
(1) Connect the 400 A probe of the ammeter to terminals 2 (M+) and 2 (S+) of the cooling fan motor.
(2) Set the intelligent tester to the oscilloscope.