ES 350 V6-3.5L (2GR-FE) (2007)
Radiator Cooling Fan Control Module: Testing and Inspection
COOLING FAN ECU
ON-VEHICLE INSPECTION
1. INSPECT 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 +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.
(c)
Measure the resistance between terminals RFC (ECM) and SI (cooling fan ECU) of the wire harness side connectors.
Standard resistance (Check for open)
Standard resistance (Check for short)
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.