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How do I check if the cooling fan ECU (attached.
2007 TOYOTA SIENNA
How do I check if the cooling fan ecu (attached to radiator) is working? Everything else seems to be working but I want to be sure before I replace this part.
have the same problem?
Wednesday, April 3rd, 2013 AT 2:31 AM
Are you referring to the temp sending unit? You need to check it for resistance.
Wednesday, April 3rd, 2013 AT 2:39 AM
No, I am referring to a black computer attached to the radiator. The two fans are wired to it.
Wednesday, April 3rd, 2013 AT 2:41 AM
1. INSPECT COOLING FAN ECU
a. Inspect the input voltage.
1. Disconnect the cooling fan ECU connector.
2. Turn the ignition switch to the ON position. Check the voltage of the +B terminal of the disconnected wire harness side connector.
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 (See ON-VEHICLE INSPECTION ).
C. Measure the resistance between terminals RFC (ECM) and SI (cooling fan ECU) of the wire harness side connectors.
If the fan does not operate, there may be a short circuit.
If the fan remains operating, there may be an open circuit.
D. Inspect the ECM power source circuit and ground circuit.
Wednesday, April 3rd, 2013 AT 5:54 AM
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