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Groundsmaster 4000--D/4010--DPage 5 -- 10Electrical 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 controllers. This is a quick way to determine if a ma-
chine malfunction is electrical or hydraulic.
NOTE: Anopen 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 the controller cover to allow access to wire
harness loopback connector (Fig. 11). Locate wire har-
ness communication port and loopback connector (Fig.
12). Carefully unplug loopback connector from harness
connector.
3. ConnecttheDiagnostic Display connector tothehar-
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. Make sure that the “OUTPUTS DISPLAYED” LED,
on lower right column ofthe Diagnostic Display, isillumi-
nated. If “INPUTS DISPLAYED” LED is illuminated,
press the toggle button on the Diagnostic Display to
change the LED to “OUTPUTS DISPLAYED”.
NOTE: It may be necessary to toggle between “IN-
PUTS DISPLAYED” and “OUTPUTSDISPLAYED” sev-
eral times to perform the following step. To change from
inputs to outputs, press toggle button once.This may be
done as often as required. Do not press and hold
toggle button.
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, HIRANGEandOKRUN outputs canbe
checked with the ignition switch in the ON position and
the engine not running. For testing of the hydraulic sole-
noid outputs (e.g. ENABLE, C DECK RAISE, R DECK
FLOAT), the engine must be running.
A. Ifthe correctoutputLED’sdo 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 loopback connector into wire har-
ness. Secure controller cover to frame.
1. Controller cover
2. Screw (2 used)
3. Flat washer (2 used)
4. U--nut (2 used)
5. TEC--5001
6. TEC--5002
Figure 11
FRONT
RIGHT
2
3
1
4
6
5
1. Wire harness connector
2. Loopback connector
3. Diagnostic display
Figure 12
1
2
3