Service Manual

Troubleshooting
For all electrical problems, the use of the quick refer-
ence troubleshooting method is recommended. Using
the Diagnostic ACE
TM
Display allows you to quickly find
the source of the electrical problem.
For inter
mittent electrical problems, which are not
repeatable, use of the Data Log System is recom-
mended. The data log system records the actual state
of machine inputs and outputs at the time of malfunction.
Your Toro Distributor can then isolate the cause of the
electrical problem.
Quick Reference Troubleshooting Guide
Controller Diagnostic Lamp
NOTE: See “Using the Diagnostic ACE” book, Form
92-800-SL for more information.
Controller Diagnostic Lamp
Before doing any troubleshooting, check green control-
l
er diagnostic lamp. If diagnostic lamp is
ON , with key
switch in RUN position, the electronic control unit (ECU)
is functioning normally.
If diagnostic lamp is FLASHING ON and OFF :
1. ECU has detected an output with a short circui
t.
2. ECU has detected an output with an open circuit.
Use diagnostic display to find which output is malfunc-
tioning.
If the diagnostic lamp is
OFF :
1. Loop-back connector is not attached.
2. Diagnostic light i
s burned out.
3. ECU is not powered on.
4. ECU is not functioning correct
ly.
Check electrical connections, input fuses and diagnos-
tic light to find malfunction. Make sure loop-back con-
nector is secured to wire harness connector.
Diagnostic ACE
TM
Display
Use diagnostic display tool to verify corr
ect electrical
function of the machine and to locate electrical
malfunctions.
1. Park machine on a level
surface, engage parking
brake, lower cutting units and turn ignition key
switch off.
2. Carefully disconnect loop-back connector from wire
harness (Fig. 7).
3. Connect diagnostic display tool to communication
connector on wiring harness (where loop-back connec-
tor was removed). Make sure correct overlay decal is
installed on diagnositc display.
4. Turn ignition key switch ON, but DO N
OT start the
engine.
Reelmaster
®
5100-D
5. The “INPUTS DISPLAYED” LED, on lower right column
of diagnositc display, should be on. If necessary, push
input-output toggle switch on diagnostic display so
“INPUTS DISPLAYED” LED is on. Do not hold the button
down.
NOTE: Red text on overlay decal refers to input
switches and green text to outputs.
2
1
3
Figure 7
1. Wire harness and connector
2. Loop-back connector
3. Controller diagnostic lamp
1
Figure 8
1. Diagnostic ACE
TM
Display
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Rev. A
Troubleshooting