Repair manual

Steering and Pitch Control CRT Repair
wc_tx000096gb.fm 62
7.10 Error Code 121 - Side Actuator Fault
7.10.1 Perform a visual inspection of the side actuator wire connections and
associated wiring. Inspect the mechanical parts to make sure no
hardware is loose and the jam nut is tight. If no faults are found
proceed to next step.
7.10.2 Turn ignition switch ON. Watch for movement of the side actuator
when the right joystick is moved to full left and right positions. If there
is little or erratic movement turn ignition switch OFF. Ensure that the
jam nut at the bottom of the actuator cylinder is tight. If the nut is loose
it will have erratic or no movement as the drive barrel will spin on the
threaded rod end. See section Removal and Installation of Electric
Steering Actuators to replace actuator. If the jam nut was tight,
proceed to next step.
7.10.3 Disconnect the wire connector labeled M2 at the actuator. Using a
digital volt/ohm meter, check actuator motor resistance at the motor
wire connector. The motor resistance should be 0.2-1.0 ohms. If the
reading is higher than 1.0 ohms, replace the actuator motor. If there is
no actuator movement, the jam nut is tight, and the motor resistance is
correct, proceed to next step.
7.10.4 Be certain the ignition switch is turned OFF. Connect the black lead of
the digital volt/ohm meter to the battery ground on the right rear frame
of the machine. Set the meter to the DC voltage scale and check
terminals of the wiring harness side of the M2 connector. The orange
and the black wires should read battery voltage with the ignition switch
OFF. Turn ignition switch ON and check both wires again. With the
right joystick in the centered position, the meter should read 0 VDC.
Connect to the orange wire and move the right joystick full left, back to
the center and to full right positions. The meter should read battery
voltage when the right joystick is moved in one direction but read 0
VDC in the center and opposite direction. Perform the same test on the
black wire; readings should be reversed. Proceed to next step.
7.10.5 Be certain the ignition switch is turned OFF. Disconnect the motor
connector from the M1 actuator motor. Cut the wire ties so the wiring
harness side of the M1 connector can be connected to the M2 actuator
motor.
Do not connect the M2 wiring harness to the M1 motor at this time!
Doing so can cause irreparable damage to the electronic components
in the steering system!
WARNING