RX 330 AWD V6-3.3L (3MZ-FE) (2004)
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If the terminal voltage is within specification and the motor is working properly, replace the cooling fan ECU.
3. Reconnect the connectors.
HINT: Wire harness condition is diagnosed by cooling fan operation.
b. Check the ECM power source.
c. Check RFC signal generation.
NOTICE: Perform this inspection when coolant temperature is 82°C (180°F) below.
1. Connect SST to M+ wire.
SST 09082-00040, 09083-00350
2. Connect an oscilloscope to terminals RFC and E1 of the ECM.
3. Check the signal generation and measure the fan amperage under the condition.
Oscilloscope indication
Oscilloscope Indication
HINT:
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If RFC signal is not as specified, replace the ECM.
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When the fan amperage has a problem despite the RFC signal that has no problem, replace the cooling fan ECU.