Operator's Manual

24
Green Diagnostic Light
The machine is equipped with a diagnostic light which
indicates if the electronic controller is functioning correctly.
The green diagnostic light (Fig. 30) is located under the
control panel, next to the fuse block. When the electronic
controller is functioning correctly and the key switch is
moved to the ON position, the controller diagnostic light
will be illuminated. The light will blink if the controller
detects a malfunction in the electrical system. The light will
stop blinking and automatically reset when the key switch
is turned to the OFF position.
1
Figure 30
1. Green diagnostic light
When the controller diagnostic light blinks, one of the
following problems has been detected by the controller:
• One of the outputs has been shorted.
• One of the outputs is open circuited.
Using the diagnostic display, determine which output is
malfunctioning, refer to Checking Interlock Switches.
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:
• Loopback is not connected.
• The light is burned out.
• Fuses are blown.
• No battery power.
Check electrical connections, input fuses and diagnostic
light bulb to determine malfunction. Make sure loopback
connector is secured to wire harness connector.
Diagnostic ACE Display
(Optional)
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.
The Diagnostic ACE display is a tool to help the user verify
correct electrical functions of the machine.
Checking the Interlock
Switches
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.
• Replace switches every two years regardless of
whether they are operating properly or not.
Caution
The purpose of the interlock switches are to prevent the
engine from cranking or starting unless the traction pedal is
in NEUTRAL, the Enable/Disable switch is in DISABLE
and the Lower Mow/Raise control is in the neutral position.
In addition, the engine will stop when the traction pedal is
depressed with either the operator off the seat or the
parking brake engaged.
To verify interlock switch function:
1. Park machine on a level surface, lower the cutting units,
stop the engine and engage the parking brake.
2. Open control panel cover. Locate wire harness and
loopback connector. Carefully unplug loopback
connector from harness connector (Fig. 31).