Groundsmaster 4300--DPage 5 -- 8Electrical System
Diagnostic Display
Groundsmaster 4300--D machines are equipped with a
TEC controller which controls machine electrical func-
tions. The controller monitors various input switches
(e.g. ignition switch, seat switch, etc.) and energizes
outputs to actuate solenoids or relays for the requested
machine function.
For the controller to c ontrol the machine as desired,
each of the input switches, output solenoids and relays
must be connected and functioning properly.
The Diagnostic Display (see Special Tools in this chap-
ter) is a tooltohelpthetechnicianverifycorrectelectrical
functions of the machine.
IMPORTANT: The Diagnostic Display must not be
left connected to the machine. It is not designed to
withstand the environment of the machine’s every
day use. When use oftheDiagnosticDisplay is com-
pleted, disconnect it from the machine and recon-
nect loopback connector to harness connector. The
machine will not operate without the loopback con-
nector installed on the harness. Store the Diagnos-
tic Display in a dry, secure, indoor location, not on
machine.
Verify Diagnostic Display Input Functions
CAUTION
The interlock switches are for the protection of
the operator and bystanders and to ensure cor-
rect operation of the machine. Do not bypass or
disconnect switches. Check the operation of the
interlockswitchesdaily for proper operation. Re-
place any malfunctioning switches before oper-
ating the machine.
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. 9).
3. Connectthe DiagnosticDisplay connectortothe har-
ness connector (Fig. 10). Make sure correct overlay de-
cal is positioned on the Diagnostic Display (Fig. 11).
4. Turn the ignition switch to the RUN position, but do
not start machine.
NOTE: The red text on the overlay decal refers to con-
troller inputs and the green text refers to controller out-
puts.
1. TEC controller location
2. Loopback connector
3. Harness connector
Figure 9
1
2
3
1. Diagnostic display 2. Loopback connector
Figure 10
1
2
Figure 11
OVERLAY
DIAGNOSTIC
DISPLAY
117--0171
