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Diagnostic Ace Display
The machine is equipped with an electronic controller
which controls most machine functions. The controller
determines what function is required for various input
switches (i.e. seat switch, key switch, etc.) and turns
on the outputs to actuate solenoids or relays for the
requested machine function.
For the electronic controller to control the machine as
desired, each of the input switches, output solenoids,
and relays must be connected and functioning properly.
Use the Diagnostic ACE display to help verify and
correct electrical functions of the machine.
Checking the Interlock
Switches
The purpose of the interlock switches is to prevent the
engine from cranking or starting unless the traction
pedal is in the Neutral position, the Enable/Disable
switch is in the Disable position, and the Lower
Mow/Raise control is in the Neutral position. In
addition, the engine should stop when the traction
pedal is pressed with operator off of the seat or if the
parking brake is left engaged.
CAUTION
If safety interlock switches are disconnected or
damaged the machine could operate unexpectedly
causing personal injury.
• Do not tamper with the interlock switches.
• Check the operation of the interlock switches
daily and replace any damaged switches before
operating the machine.
Verifying the Interlock Switch Function
1. Park the machine on a level surface, lower the
cutting units, stop the engine, and engage the
parking brake.
2. Remove the access panel from the side of the
control arm.
3. Locate the wire harness and connectors near the
controller (Figure 47).
1. Wire harness and connectors
4. Carefully unplug loop back connector from harness
connector.
5. Connect the Diagnostic ACE display connector to
the harness connector (Figure 48).
Note: Make sure correct overlay decal is positioned
on Diagnostic ACE display.
1. Diagnostic ACE
6. Turn the key switch to the On position, but do not
start the machine.
Note: The red text on the overlay decal refers to
input switches and the green text refers to outputs.
7. The "inputs displayed" LED, on the lower
right column of the Diagnostic ACE, should be
illuminated. If the "outputs displayed" LED is
illuminated, press the toggle button, on Diagnostic
ACE, to change LED to "inputs displayed".
The Diagnostic ACE will illuminate the LED
associated with each of the inputs when that input
switch is closed.
33
Figure 47
Figure 48
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