Toro 03540 Operator's Manual page 22

Operation
switch is closed.
Individually, change each of the switches from
open to closed (i.e., sit on the seat, engage the
traction pedal, etc.), and note that the
appropriate LED on the Diagnostic ACE will
blink on and off when the corresponding
switch is closed. Repeat this check on each
switch.
7. If a switch is closed and the appropriate LED
does not turn on, check all wiring and
connections to the switch and/or check switches
with an ohm meter. Replace any defective
switches and repair any defective wiring.
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.
To verify output function:
1. Park the machine on a level surface, lower the
cutting units, stop the engine and engage the
parking brake.
2. Open the control panel cover. Locate the wire
harness and connectors near the controller.
Carefully unplug the connector from the
harness connector. Set the height-of-cut
selector knob to position "A".
3. Connect the Diagnostic ACE connector to the
harness connector. Make sure the correct
overlay decal is positioned on the Diagnostic
ACE.
4. Turn the key switch to ON, but do not start the
engine.
Note: The red text on the overlay decal refers
to input switches and the green text refers to
outputs.
5. The "output displayed" LED on the lower right
column of Diagnostic ACE should be
illuminated. If the "inputs displayed" LED is
illuminated, press the toggle button on
Diagnostic ACE to change the LED to "outputs
22
displayed".
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 the toggle button once.
This may be done as often as required. DO
NOT HOLD THE BUTTON.
6. Sit on the seat and try to operate the desired
function of the machine. The appropriate output
LEDs should illuminate to show that the ECU
is turning on that function. (Refer to the list on
page 25, to be certain of the specified output
LEDs.
Note: If any output LED is blinking, this indicates
an electrical problem with that OUTPUT. Repair/
replace defective electrical parts immediately. To
reset a blinking LED, turn the key switch "OFF',
then back "ON".
It no output LEDs are blinking, but the correct
output LEDs do not illuminate, verify that the
required input switches are in the necessary
positions to allow that function to occur. Verify
correct switch function.
If the output LEDs are on as specified, but the
machine does not function properly, this indicates a
non-electrical problem.
Note: Due to electrical system constraints, the
output LEDs for "START", "PREHEAT" 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, check the electrical circuit with a
volt/ohm meter to verify that no electrical problem
exists for these functions.
If each output switch is in the correct position and
functioning correctly, but the output LEDs are not
correctly illuminated, this indicates an ECU
problem. If this occurs, contact your Toro
Distributor for assistance.
IMPORTANT: The Diagnostic ACE display must
not be left connected to the machine. It is not
designed to withstand the environment of the