Repair manual

Steering and Pitch Control CRT Repair

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7.13 Error Code 121—Side Actuator Fault

A side actuator fault may be caused by faulty wiring to the actuator

motor, a loose actuator jam nut, a faulty actuator motor, or a

malfunctioning control board.

7.13.1 Check the condition of the wiring and wire connections at the actuator

motor. If necesary, check the continuity of the wiring between the

control board and the actuator motor. If the wiring is OK, continue.

7.13.2 Turn the ignition switch ON. Watch for movement of the side actuator

when the right joystick is moved to the full-left and full-right positions.

• If there is little or erratic movement, turn the

ignition switch OFF. Check that the jam nut (a)

at the bottom of the actuator cylinder is tight. If

the jam nut is loose, the actuator will have

erratic or no movement. Apply red Loctite or an

equivalent to the jam nut and tighten. See sec-

tion Removal and Installation of Electric Steer-

ing Actuators.

• If the jam nut is tight, continue.

7.13.3 To test the actuator motor: Turn the ignition

switch OFF. Disconnect the wiring harness

from the side actuator motor M2. Use a

multimeter and check the resistance of the

actuator motor’s windings. Do so by probing

the connector (b). The resistance should be

0.2–1.0 Ohms.

• If more than 1.0 Ohms is measured,

replace the right actuator.

• If 0.2–1.0 Ohms is measured, continue.

7.13.4 The next two tests will check the control board.

First, with the ignition switch turned OFF,

check for battery voltage at the wiring harness

(c). There should be battery voltage between

the orange wire and ground and between the

black wire and ground.

• If battery voltage is not measured, check

the continuity of the wiring. Repair or

replace the wiring as needed.

• If battery voltage is measured, continue.

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