Toro 10178SL Service Manual Groundsmaster 4300 D Preface Publication

Troubleshooting
For effective troubleshooting and repairs, there must be
a good understanding of the electrical circuits and com-
ponents used on this machine (see Chapter 8 -- Foldout
Drawings). If  the machine has any  interlock switches
by--passed, they must be reconnected for proper trou-
bleshooting and safety.
CAUTION
Remove   all    jewelry,   especially    rings   and
watches,  before  doing  any  electrical trouble-
shooting  or   testing.  Disconnect   the  battery
cables unless the test requires battery voltage.
NOTE:  Use the Diagnostic Display (see Special Tools
in this chapter) to test Toro Electronic Controller inputs
and outputs when troubleshooting an electrical problem
on your Groundsmaster.
Diagnostic Light
Groundsmaster 4300--D machines are equipped with a
diagnostic light that indicates  if the machine electrical
systemisfunctioning  correctly.Thediagnostic lightislo-
cated on the control panel (Fig. 7).
2
When the ignition switch is moved to the RUN position
and the  machine electrical system is  functioning pro-
perly, the diagnostic light will be illuminated for approxi-
mately three (3) seconds and then will turn off. The light
should remain off during normal machine operation.
1
If the machine TEC controller detects an electrical sys-
tem malfunction (fault)  during machine operation,  the
diagnostic light will flash rapidly. The light will stop flash-
ing and will automatically reset when the ignition switch
is turned to the OFF position. The fault, however, will be
retained in controller memory and can be retrieved at a
future time (see Retrieving Fault Codes below).
Figure 7
If the diagnostic light does not illuminate when the igni-
tion  switch  is turned  to  the  RUN  position, possible
causes are:
1.
Control panel
2.
Diagnostic light
D   The loopback connector is not connected to the
machine wire harness (Fig. 8).
D   The diagnostic light (or circuit wiring) is faulty.
3
D   TEC controller fuses are faulty (see Fuses in the
Component Testing section of this chapter).
2
1
D   The TEC controller is faulty.
Check electrical connections, controller  fuses and the
diagnostic light  to determine  malfunction. Make  sure
that the loopback connector is secured to the wire har-
ness connector.
Figure 8
1.
2.
TEC controller location
Loopback connector
3.
Harness connector
Electrical System
Page 5 -- 6
Groundsmaster 4300--D
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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