PS S8.0 8200
001 OE35
Version no T-code
F-code Section C-code
Micro 70 Wire Guidance
318
Service Manual 1997-10-24
connected to.
As the antenna is moved across the guidewire check
for the voltage between MO and M1 to change from
positive to negative up to battery volts. If the voltage
does not change as stated replace the FSA.
I. With the truck power on as shown above in h4, hold
the steer wheel antenna one and a half inches (1.5
in.) over the guidewire and move the antenna from
one side of the guidewire to the other; about two
inches (2 in.) of total movement.
Measure the voltage between the white and the
black wires connected to the electric steering motor.
It does not matter which wire the positive lead or
negative lead of the volt meter is connected to.
As the antenna is moved across the guidewire check
for the voltage between the white and black wires
connected to the electric steering motor to change
from positive to negative up to battery volts. If the
voltage does not change as stated repair the open
wire or open #1 control relay tips between the FSA
and the electric steering motor.
m. Replace electric power steering motor.
5. The truck will not guide in auto mode. Truck operates
normally in manual mode but, when switched to auto
mode and the guidewire is acquired (green “on wire”
light comes on), the Micro 70 system will not make any
steering corrections; steering effort is harder in auto
mode.
This chart is meant for a truck that will not make any
steering corrections even though the "on wire" light
comes on. If the truck even tries to make steering
corrections go to chart 6.
a. Drive the truck in manual mode and take note of the
effort required to turn the steering wheel.
Now drive the truck along the guidewire in auto
mode with the green “on wire” light on. Take note of
the effort required to turn the steering wheel when
the green “on wire” light is on. If the steering effort is
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