Verify Diagnostic Display Output Functions - Toro GroundsmasterR 4300-D Service Manual

Verify Diagnostic Display Output Functions

The Diagnostic Display also has the ability to detect
which output solenoids or relays are turned on by the
TEC controller. This is a quick way to determine if a ma-
chine 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. Open control panel cover. Locate wire harness and
connectors near TEC controller. Carefully unplug loop-
back connector from harness connector (Fig. 12).
3. Connect the Diagnostic Display connector to the har-
ness connector. Make sure correct overlay decal is posi-
tioned on the Diagnostic Display (Fig. 13).
4. Turn the ignition switch to the RUN position.
NOTE: The red text on the overlay decal refers to con-
troller inputs and the green text refers to controller out-
puts.
5. The green "OUTPUTS DISPLAYED" LED, on lower
right column of the Diagnostic Display, should be illumi-
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 "OUTPUTS DISPLAYED" 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, start engine and attempt to operate the
desired function of the machine. The appropriate output
LED's should illuminate on the Diagnostic Display to in-
dicate that the TEC controller is turning on that function.
NOTE: If the "DIAG. LAMP" output LED is blinking, this
indicates that the TEC controller has detected a fault
during machine operation. Refer to Diagnostic Light in
this section for information on retrieval and clearing of
controller faults.
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 (see TEC
Controller Logic Chart in this section). Verify correct
switch function.
Electrical System
B. If the output LED's are on as specified, but the
machine does not function properly, consider that
the controller is operating correctly and a problem
exists with some other component. Inspect electrical
components and circuit for the affected function.
Also, suspect a non-electrical problem (e.g. hydrau-
lic 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 controller prob-
lem. If this occurs, contact your Toro Distributor for
assistance.
7. After output function testing is completed, discon-
nect the Diagnostic Display from wire harness. Plug
loopback connector into harness connector. Install con-
trol panel cover.
3
2
1. TEC controller location
2. Loopback connector
DIAGNOSTIC
DISPLAY
OVERLAY
117- -0171
Page 5 - - 10
1
Figure 12
3. Harness connector
Figure 13
Groundsmaster 4300--D