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properly. If the machine kills the light will turn on steady
until the key position is changed. 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 once the fault has been
resolved.
1. 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 the 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 as follows:
•
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
4 Wheel Drive only
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.
Figure 20
Use the Diagnostic ACE display tool and over lay to help
verify and correct electrical functions of the machine. Contact
your Toro distributor for assistance.
Checking the Interlock
Switches
4 Wheel Drive only
The purpose of the interlock switches is to prevent the engine
from cranking or starting unless the traction pedal is in the
Neutral position and the PTO is disengaged. 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
attachment, stop the engine, and engage the parking
brake.
2. Raise the seat.
3. Locate the wire harness and connectors near the
controller (Figure 21).
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