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Micro 70 Wire Guidance
PS
S8.0
8200
F-code
Section
C-code
Version no
T-code
001
OE35
© BT Products
319
Service Manual
1997-10-24
harder in auto mode, with the green “on wire” light
on, continue with tests below. If the steering effort is
the same in manual and auto modes use chart 4.
b. Inspect mechanical coupler between electric
steering motor for Micro 70 system and hydraulic
torque generator on truck. Make repairs as needed
and re-evaluate symptoms.
Make the following tests with the Micro 70 system in the
auto mode and the truck over the guidewire so that the
green "on wire" light is on. The foot pedal must be
depressed so that the power steering motor is running.
The following tests require that the front antenna (steer
wheel antenna) be removed from the truck and moved
across the guidewire while voltage tests are being
made. Also the inhibit signal to the FSA must be
disconnected so that the Micro 70 system may try to
steer the truck even though the truck is not actually
moving. Unplug the truck battery before disconnecting
or reconnecting any component to the Micro 70
controller.
b1. Unplug truck battery.
b2. Disconnect and remove front antenna
(steer
wheel antenna) from truck. Reconnect antenna
after it is removed from truck.
b3. Disconnect white wire from K8-3.
b4. Reconnect truck battery and make the following
tests with the Micro 70 system in the auto mode
and the truck over the guidewire so that the green
“on wire” light is on. The foot pedal must be
depressed so that the power steering motor is
running.
C. With the truck power on as shown above in b4, 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 terminals K8-11, S+
red wire, and K8-15, S-black wire, on the Micro 70. It
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