Ford Electric Ranger 2001 Manual page 225

303-03-4
DESCRIPTION AND OPERATION (Continued)
The cooling system removes heat from various
electronic components. The coolant pump has a
centrifugal impeller design with a 12-volt permanent
magnet motor. The pump is used to circulate the
coolant through the DC/DC module,
motor/transaxle, and the traction inverter module
(TIM). Because of the Electric Rangers unique
systems, vehicle coolant is not used in the
heating/defrosting system.
DIAGNOSIS AND TESTING
Cooling System
Diagnostic Trouble Code (DTC) Definition
The following DTC relates to the Cooling System:
• DTC C1774 Coolant Temperature Sensor Out of
Range
— The interface adapter assembly (IAA) module
operates the radiator cooling fan based on
coolant temperature. The IAA module uses the
coolant temperature sensor to monitor the
coolant temperature. The normal range of the
coolant temperature sensor is between -40°C
(-40°F) and 150°C (302°F). If the coolant
temperature sensor is reading out of range, the
IAA module sets DTC C1774.
Engine Cooling
The interface adapter assembly (IAA) controls the
operation of the electric coolant pump and the
electric radiator fan, based upon vehicle coolant
temperature. The IAA receives the temperature
information from the coolant temperature sensor,
which is located near the coolant pump. The pump
circulates coolant through the vehicle using a
combination of rubber hoses and metal tubing. The
IAA energizes the pump whenever the ignition key
is in the ON position and during traction battery
charging if the DC/DC module is charging the
auxiliary 12-volt battery. The electric fan is also
controlled by the IAA. If the coolant temperature
exceeds 40°C (104°F), the cooling fan runs at low
speed. If the coolant temperature rises above 45°C
(113°F), the cooling fan runs at high speed. The
IAA turns the cooling fan off when the coolant
temperature is less than 35°C (95°F). The IAA will
also activate the fan during vehicle charging if the
DC/DC module is charging the auxiliary battery.
Electrical Schematic
Refer to Electrical and Vacuum Troubleshooting
Manual, Cell 33, Cooling System for schematic and
connector information.
Inspection and Verification
g to Section 100-07.
2001 Ranger EV, 01/2001
303-03-4