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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.
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.
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 (See ON-VEHICLE INSPECTION ).
C. Measure the resistance between terminals RFC (ECM) and SI (cooling fan ECU) of the wire harness side connectors.
HINT: 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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