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If the diagnostic light is not illuminated when the key
switch is in the On position, this indicates that the
electronic controller is not operating. Possible causes
are as follows:
• Loop-back is not connected.
• The light is burned out.
• Fuses are blown.
• It is not functioning correctly.
Check the electrical connections, input fuses, and
diagnostic light bulb to determine the malfunction.
Ensure that the loop-back connector is secured to the
wire harness connector.
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 PTO switch is in
the OFF position, and the lift switch 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 located beneath the front
of the seat (Figure 45).
3. Locate the wire harness and connectors near the
controller (Figure 45).
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 46).
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.
33
Figure 45
Figure 46
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