Ford Electric Ranger 2001 Manual page 181

211-02-3
DESCRIPTION AND OPERATION (Continued)
The power steering system on the Postal Ranger EV
is composed of a steering gear and steering linkage
from the Explorer. Pressure for the power steering
is supplied by an electrically operated pump. A
steering wheel sensor is mounted on the column to
provide turning information to the power steering
pump. An electronic controller receives the steering
wheel sensor input and vehicle speed information
from the traction inverter module (TIM). Based
upon this information, the electronic controller
varies the pump output to meet current vehicle
needs.
DIAGNOSIS AND TESTING
Power Steering
Diagnostic Trouble Code (DTC) Definition
The following DTC relates to the power steering
system:
• DTC C1778 Power Steering Failure
— The power steering assembly has a fault line
that it uses to notify the interface adapter
assembly (IAA) module when a power
steering system fault occurs. The power
steering assembly outputs a 12-volt signal over
the fault line when there is no fault and pulls
it low (0 volts) when it detects a fault. The
IAA module generates DTC C1778 if it
detects the power steering fault line is low for
more than 30 seconds with the power steering
assembly enabled. The signal stays low until
the concern has been corrected.
Power Steering
The power steering pump can be heard when the
vehicle is turned on and the steering wheel is turned
while the vehicle is stationary. This will cause the
pump to operate at full output. Once the steering
wheel is released, the pump will return to normal.
At temperatures lower than -6.7°C (20°F), the pump
may take up to 30 seconds before it is able to
provide full assist.
Electrical Schematic
Refer to Electrical and Vacuum Troubleshooting
Manual, Cell 43, Electronic Power Steering for
schematic and connector information.
Inspection and Verification
Refer to Section 100-07.
2001 Ranger EV, 01/2001
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