Troubleshooting; Troubleshooting; Diagnostic Light - Toro Reelmaster 3550-D 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.

Diagnostic Light

Reelmaster machines are equipped with a diagnostic
light that indicates if the machine electrical system is
functioning correctly. The diagnostic light is located on
the control panel (Fig. 7).
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 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).
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 located below the con-
trol panel is not connected to the wire harness
(Fig. 8).
D The diagnostic light (or circuit wiring) is faulty.
D TEC controller fuses are faulty (see Fuses in this
chapter).
D The TEC controller is faulty.
Test 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
For effective troubleshooting and repairs, there must be
a good understanding of the electrical circuits and com-
ponents used on this machine (see Chapter 10 − Fold-
out Drawings in this manual).
If the machine has any interlock switches by−passed,
reconnect the switches for proper safety and trouble-
shooting.
NOTE: Use the Diagnostic Display (see Special Tools
in this chapter) to test Electronic Control Module inputs
and outputs when troubleshooting an electrical problem
on your Reelmaster.
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1. Control panel
1
2
1. Control panel
2. Loopback connector
Page 5 − 6
Figure 7
2. Diagnostic light
3
Figure 8
3. Harness connector
Reelmaster 3550−D/3555−D/3575−D
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