Troubleshooting; Diagnostic Light (4Wd Machines) - Toro Groundsmaster 360 Service Manual

Troubleshooting

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.
For effective troubleshooting and repairs, there must be
a good understanding of the electrical circuits and com-
ponents used on this machine. Refer to Chapter 9 --
Foldout Drawings for electrical schematics and wire har-
ness drawings for your Groundsmaster.

Diagnostic Light (4WD Machines)

Groundsmaster 360 machines with 4WD are equipped
with a diagnostic light that indicates if the machine elec-
trical system is functioning incorrectly. The diagnostic
light is located on the control panel (Fig. 8).
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.
If the machine TEC controller detects an electrical
system malfunction (fault) during machine operation,
the diagnostic light will flash rapidly. The light will stop
flashing 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 re-
trieved at a future time (see Retrieving Fault Codes be-
low).
If the diagnostic light does not illuminate when the igni-
tion switch is turned to the RUN position, possible
causes are:
D The loopback connector is not connected to the
machine wire harness (Fig. 9).
D The diagnostic light (or circuit wiring) is faulty.
D TEC controller fuses are faulty (see Fuses in the
Component Testing section of this chapter).
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.
Electrical System
Make sure that all machine interlock switches are func-
tioning correctly for proper troubleshooting and safety.
NOTE: When troubleshooting an electrical problem on
a Groundsmaster 360 with 2WD, use the Standard Con-
trol Module input and output LED's (see Standard Con-
trol Module in the Component Testing section of this
chapter). When troubleshooting an electrical problem
on a Groundsmaster 360 with 4WD, use the Diagnostic
Light and the Diagnostic Display (see Diagnostic Light
(4WD Machines) and Diagnostic Display (4WD Ma-
chines) in this section).
1
1. Control panel
2
1. TEC controller location
Page 5 - - 6
2
Figure 8
2. Diagnostic light
1
Figure 9
2. Loopback connector
Groundsmaster 360