Verify Diagnostic Display Output Functions - Toro Groundsmaster 4700-D Service Manual

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: An open output (e.g. an unplugged connector or
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. Connect the Diagnostic Display connector to the har-
ness connector. Make sure correct overlay decal is posi-
tioned on the Diagnostic 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-
puts displayed" LED is illuminated, press the toggle but-
ton on the Diagnostic Display to change the LED to
"outputs displayed".
NOTE: It may be necessary to toggle between "inputs
displayed" and "outputs displayed" several times to per-
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
GLOW PLUGS, HI RANGE and OK RUN outputs can be
checked with the ignition switch in the ON position and
the engine not running. For testing of the solenoid out-
puts (e.g. PTO 1, CENTER DECK UP, R DECK FLOAT),
the engine must be running.
Groundsmaster 4500--D/4700--D
A. If the correct output LED's do not illuminate, verify
that the required input switches are in the necessary
positions to allow that function to occur.
B. If the output LED's are on as specified, but the
machine does not function properly, suspect a failed
electrical component, an open in the tested circuit or
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 your Toro Distributor
for assistance.
7. After output functions testing is complete, discon-
nect the Diagnostic Display connector from the harness
connector and plug loop back connector into wire har-
ness. Secure access plate to frame.
3
1. Wire harness connector
2. Loop back connector
Page 5 - - 9
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Figure 11
3. Diagnostic display
Electrical System