Ford Ranger EV (2001 year). Manual — part 51

211-05-1

Steering Column Switches

Manual Table of Contents

SECTION 211-05 Steering Column Switches

VEHICLE APPLICATION:

Ranger EV

CONTENTS

PAGE

DESCRIPTION AND OPERATION

Steering Column Switches. . . . . . . . . . . . . . . . . . ...

211-05-2

211-05-2

Steering Column Switches

Traction Bus Operation

DESCRIPTION AND OPERATION

After a key transition from OFF to RUN, if the

Steering Column Switches

vehicle is not being charged the traction inverter

The key positions on the Electric Ranger are the

module (TIM) will begin to precharge the traction

same as on the gasoline-powered Ranger. There are

high-voltage bus. This is accomplished by sending a

five key positions. They are ACC, LOCK, OFF,

hardware signal from the TIM to the contactor box

RUN, and START.

indicating the need for precharging the high-voltage
bus. On receipt of this signal, the contactor box

Off, Lock, and Accessory

closes the negative main contactor, delays for a

Vehicle charging can be done when the vehicle is in

fraction of a second, and closes the main precharge

either the LOCK or the OFF position. In the LOCK

contactor. The bus voltage then rises in the TIM as

position, the steering wheel is locked into position

charge is transferred from the traction battery to the

and the key can be removed. The ACCESSORY

bus capacitors in the TIM via a current limiting

position allows use of some accessories, such as the

resistor located in the contactor box. The TIM

radio and wipers.

remains in this state for up to five minutes or until

Run

the key switch position is changed. If the key is

RUN is the normal operating position for the

then placed in the START position and released, the

Electric Ranger. If the key is cycled through the

TIM commands the main traction contactor closed

START position and is released to the RUN

and then opens the main precharge contactor. At

position, the powertrain is enabled. The vehicle can

this time the TIM transmits a message via standard

be charged while in the RUN position, but charge

corporate protocol (SCP) to the interface adapter

times will likely increase.

assembly (IAA) module indicating that the traction
system is enabled, and the IAA module activates the

Start

motor enabled gauge. When the key is returned to

The key must be cycled to the START position and

the OFF or LOCK position, the TIM commands the

released to start the Electric Ranger. This should be

contactors to open and inform the IAA module that

done with the vehicle in PARK. Since the

the motor is not enabled, thus returning the traction

powertrain for the Electric Ranger is virtually silent,

system to the off state.

the operator should refer to the enabled gauge in the
upper right corner of the cluster to determine if the
vehicle has been started.

211-05-3

Steering Column Switches

DESCRIPTION AND OPERATION (Continued)

Auxiliary Bus Operation
After a key transition from OFF to RUN, the IAA
module will wake up and request authority to use
the high-voltage auxiliary bus from the battery
control module (BCM). If the BCM grants the
authority, the IAA module will request the auxiliary
bus to close. The contactor box will close the
negative main contactor and the auxiliary precharge
contactor, thus allowing charge to flow from the
traction battery to the direct current to direct current
(DC/DC) converter, A/C inverter motor controller
(IMC), power steering module, and the positive
temperature coefficient (PTC) switching module,
thereby charging their internal bus capacitors. When
the voltage differential between the traction battery
and the auxiliary bus is below 20 volts, the
contactor box closes the auxiliary bus contactor and
signals to the IAA module the completion of this
operation. At this time, the IAA module will enable
the DC/DC converter, power steering system, and if
commanded, the climate control system. When the
key is switched back to OFF , the auxiliary bus
contactor is opened. If the vehicle is being charged,
the IAA module may close the auxiliary contactor
in order to operate the DC/DC converter. If this
happens, the contactor will be closed for 10 minutes
per cycle.