Verify Output Function - Toro Groundsmaster 580-D Service Manual

Note: The red text on the overlay decal refers to input
switches and the green text refers to output switches.
5. The Inputs Displayed LED on lower right column of
the Diagnostic ACE should be lighted. If the Outputs Dis-
played LED is lighted, press and release Toggle Input/
Output button on Diagnostic ACE to change to the
Inputs Displayed LED. Do not hold button down.
Note: The Diagnostic ACE will illuminate a LED
associated with each input when its associated input
switch is closed.
6. Change each switch individually from open to
closed (i.e., sit on seat, engage traction pedal, etc.).
A. Observe that the appropriate LED on Diagnostic
ACE blinks on and off when its corresponding
switch is opened and closed. Check each switch
that can be actuated by hand.
B. Now start engine and raise and lower each cut-
ting unit. Note the appropriate LED on the Diagnos-
tic ACE (i.e. LED is illuminated when cutting unit is
lowered and LED is not illuminated when cutting unit
is raised.
7. If switch is closed and appropriate LED does not
turn on, check all wiring and connections to switch and/
or check switch with an ohm meter. Replace any defec-
tive switches and repair any defective wiring.

Verify Output Function

The Diagnostic ACE also has the ability to detect which
output solenoids or relays are turned on. This is a quick
way to determine if a machine malfunction is electrical
or hydraulic.
1. Park machine on a level surface, lower the cutting
units, stop the engine and engage the parking brake.
2. Locate wire harness and connectors near control-
ler. Carefully unplug loopback connector from harness
connector.
3. Connect the Diagnostic ACE connector to the har-
ness connector. Make sure correct overlay decal is posi-
tioned on Diagnostic ACE.
4. Turn Ignition switch to ON; do not start machine.
Note: The red text on the overlay decal refers to input
switches and the green text refers to output switches.
5. The Outputs Displayed LED on the lower right col-
umn of the Diagnostic ACE should be lighted. If the In-
puts Displayed LED
Input/Output button on the Diagnostic ACE to change
the LED to Outputs Displayed.
Groundsmaster 580--D
is lighted, press Toggle
Note: It may be necessary to toggle between Inputs
Displayed and Outputs Displayed several times to do
the following step. To toggle back and forth, press
Toggle Input/Output button once. This may be done as
often as required. Do not hold button.
6. Operate desired function switch on the machine.
The appropriate output LED's should illuminate to indi-
cate that the ECU is turning on that function.
Note: If any output LED is blinking, this indicates an
electrical problem with that OUTPUT. Repair or replace
defective electrical parts immediately. To reset a blinking
LED, turn Ignition switch to OFF and then back to ON.
If output LED's are not blinking and not lighted, verify
that the required input switches are in their necessary
positions to allow that function to occur. Verify correct
switch position or output.
If the output LED's are on as specified with the machine
not functioning properly, a non--electrical problem exits.
Repair as necessary.
If each input switch is in the correct position and func-
tioning correctly with the output LED's not correctly
lighted, an ECU problem exits. If this condition occurs,
contact your Toro Distributor for assistance.
Note: Due to electrical system constraints, the output
LED's for "START", "MONITOR" and "ETR/ALT" may
not blink even though an electrical problem may exist for
those functions. If the machine problem appears to be
with one of these functions, be certain to check the elec-
trical circuit with a volt / ohm meter to verify that no elec-
trical problem exists to these functions.
If electronic controller experiences an output failure for
either the cruise control or one of the cutting units, the
controller will disable the machine function.
Indications that this is the cause of the problem include:
A. Flashing green diagnostic light.
B. Diagnostic ACE will illuminate the "output fail"
LED.
C. Diagnostic ACE will flash which output failed.
D. Machine will not respond to ignition key inputs.
The above indicates an ECU problem, contact your local
Authorized TORO Distributor for assistance.
If each output switch is in the correct position and func-
tioning correctly, but the output LED's are not correctly
illuminated, this indicates an ECU problem. If this oc-
curs, contact your Toro Distributor for assistance.
Page 8 - - 9 Electrical System (S/N 30101 & Up) (Rev. E)