HOW DO I CHECK IF THE COOLING FAN ECU ATTACHED ...

2007 Toyota Sienna

Tiny

Adrielreddy

April, 3, 2013 AT 2:31 AM

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.

3 Answers

Tiny

Jacobandnickolas

April, 3, 2013 AT 2:39 AM

Are you referring to the temp sending unit? You need to check it for resistance.

Tiny

Adrielreddy

April, 3, 2013 AT 2:41 AM

No, I am referring to a black computer attached to the radiator. The two fans are wired to it.

Tiny

KHLow2008

April, 3, 2013 AT 5:54 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.

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