Taurus V6-232 3.8L (1989)
Radiator Cooling Fan Motor Relay: Description and Operation
The electro-drive cooling fan system consists of a two-speed fan on all 3.8L engines with ATX, attached to a fan shroud located behind the radiator.
The electro-drive cooling fan is wired to operate only when the ignition switch is in the RUN position, thereby preventing cooling fan operation after
the ignition switch is turned to the OFF position.
WARNING: DISCONNECT THE COOLING FAN PRIOR TO PERFORMING ANY UNDERHOOD SERVICE SINCE THE FAN COULD
CYCLE IF THE IGNITION SWITCH IS LEFT IN THE ON POSITION EVEN THOUGH THE ENGINE IS NOT RUNNING.
The cooling fan is controlled during vehicle operation by the integrated control module assembly and EEC-IV module, which will energize the cooling
fan under the following conditions:
Cooling fan is turned on at low speed if:
a. Engine temperature is higher than normal. (Fan starts running at 102°C (215°F), and stops running at 99°C (210°F)).
b. A/C is on and vehicle speed does not provide enough natural airflow (Fan starts running at speeds at or below 69 km/h (43 mph) and stops
running at 77 km/h (48 mph)).
The 3.8L uses a dual winding fan motor in which low speed motor operation is achieved through the low speed motor winding circuit (no dropping
resistor).
Cooling Fan Motor Circuit Diagram-3.8L Engines
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Cooling fan will run at high speed if:
a. Engine temperature is higher than desirable and fan has been operating at low speed. Fan starts running at high speed at 110°C (230°F), and
stops running at 107°C (224°F)).
Several different integrated controller modules are available depending on application. Proper operation of the system cannot be obtained unless the
correct integrated controller module is used.
Note: In addition to the cooling system the CCRM also controls these other systems.
PURPOSE
The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM) to provide control of the cooling fan, A/C
clutch, and fuel pump. The module includes the Electronic Engine Control (EEC) power relay to provide power to the PCM.
These relays are contained in one housing, resulting in longer service life and reduced wiring requirements for operation.
CONSTRUCTION
The CCRM has one 24-pin connector. Relays contained in the housing are independent of one another.
OPERATION
The relays contained within the CCRM are interdependent and work with each other. The following describes the different relay functions within
the CCRM:
EEC Power Relay
For any other circuit in the CCRM to operate, this circuit must be powered up. This prevents actuators from being turned on without the EEC
system having control over them.
Fuel Pump Relay
The fuel pump relay circuit controls the fuel pump. The PCM provides the ground circuit for the primary side of the relay. The secondary side
supplies Battery Voltage (B+) to the fuel pump itself.
Low Fan Control Relay
The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the LFC relay is normally high (B+). In this