Toro 30857 - Verify Diagnostic Display Output Functions

Groundsmaster 4500--D/4700--D Page 5 -- 9 Electrical System
Verify Diagnostic Display Output Functions
The Diagnostic Display also has the ability to detect
which output solenoids or relays are energized by the
TEC controller(s). This is a quick way to determine if a
machine malfunction is electrical or hydraulic.
NOTE: Anopenoutput(e.g.anunpluggedconnectoror
a broken wire) cannot be detected with the Diagnostic
Display.
1. Park machine on a level surface, lower the cutting
decks, stop the engine and engage the parking brake.
2. Remove plate in front of seat to allow access to wire
harness loop back connector. Locate wire harness and
loop back connector (Fig. 11). Carefully unplug loop
back connector from harness connector.
3. ConnecttheDiagnosticDisplayconnectortothehar-
nessconnector.Makesurecorrectoverlaydecalisposi-
tioned on the D iagnostic Display (Figs. 9 and 10).
4. Turn the ignition switch to the ON position.
NOTE: The red text on the Diagnostic Display overlay
decal refers to input switches and the green text refers
to TEC outputs.
5. The “outputs displayed
” LED, on lower right column
of the Diagnostic Display, should be illuminated. If “
in-
putsdisplayed
”LEDisilluminated,pressthetogglebut-
ton on the Diagnostic Display to change the LED to
“outputs displayed
”.
NOTE: It may be necessary to toggle between “
inputs
displayed
”and“outputsdisplayed”severaltimestoper-
form the following step. To change from inputs to out-
puts, press toggle button once. This may be done as
often as required. Do not press and hold toggle but-
ton.
6. Sit on seat and attempt to operate the desired func-
tion of the machine. The appropriate output LED’s
should illuminate on the Diagnostic Display to indicate
that the TEC controller is turning on that function. The
GLOWPLUGS,HIRANGEandOKRUNoutputscanbe
checked with the ignition switch in the ON position and
the engine not running. For testing of the solenoid out-
puts(e.g.PTO1,CENTERDECKUP,RDECKFLOAT),
the engine must be running.
A. IfthecorrectoutputLED’sdonotilluminate,verify
thatthe required inputswitchesareinthe necessary
positions to allow that function to occur.
B. If the output LED’s are on as specified, but the
machinedoes notfunction properly,suspectafailed
electricalcomponent,an open in the testedcircuitor
a non-electrical problem (e.g. hydraulic component
problem). Repair as necessary.
C. If each input switch is in the correct position and
functioning correctly, but the output LED’s are not
correctly illuminated, this indicates a TEC controller
problem. If this occurs, contact y our Toro Distributor
for assistance.
7. After output functions testing is complete, discon-
necttheDiagnosticDisplayconnector fromtheharness
connector and plug loop back connector into wire har-
ness. Secure access plate to frame.
1. Wire harness connector
2. Loop back connector
3. Diagnostic display
Figure 11
1
2
3
Electrical
System