Toro Reelmaster 3550-D Preliminary Service Manual page 53

Verify Diagnostic Display Output Functions
The Diagnostic Display also has the ability to detect
which output solenoids or relays are energized by the
TEC controller(s). This is a quick way to determine if a
machine malfunction is electrical or hydraulic.
NOTE: An open output (e.g. an unplugged connector or
a broken wire) cannot be detected with the Diagnostic
Display.
1. Park machine on a level surface, lower the cutting
units, stop the engine and engage the parking brake.
2. Remove cover from control panel to allow access to
wire harness loop--back connector. Locate wire harness
and loop--back connector (Fig. 12). Carefully unplug
loop--back connector from wire harness connector.
3. Connect the Diagnostic Display connector to the
wire harness connector. Make sure correct overlay de-
cal is positioned on the Diagnostic Display (Fig. 13).
4. Turn the ignition switch to the ON position.
NOTE: The red text on the Diagnostic Display overlay
decal refers to input switches and the green text refers
to TEC outputs.
5. The "outputs displayed" LED, on lower right column
of the Diagnostic Display, should be illuminated. If "in-
puts displayed" LED is illuminated, press the toggle but-
ton on the Diagnostic Display to change the LED to
"outputs displayed".
NOTE: It may be necessary to toggle between "inputs
displayed" and "outputs displayed" several times to per-
form the following step. To change from inputs to out-
puts, press toggle button once. This may be done as
often as required. Do not press and hold toggle but-
ton.
6. Sit on seat and attempt to operate the desired func-
tion of the machine. The appropriate output LED's
should illuminate on the Diagnostic Display to indicate
that the TEC controller is turning on that function. Some
of the outputs can be checked with the ignition switch in
the ON position and the engine not running. For testing
of the solenoid outputs (e.g. SV1, SV2, SV3), the engine
must be running.
A. If the correct output LED's do not illuminate, verify
that the required input switches are in the necessary
positions to allow that function to occur.
B. If the output LED's are on as specified, but the
machine does not function properly, suspect a failed
electrical component, an open in the tested circuit or
a non-electrical problem (e.g. hydraulic component
problem). Repair as necessary.
Reelmaster 3550--D
C. If each input switch is in the correct position and
functioning correctly, but the output LED's are not
correctly illuminated, this indicates a TEC controller
problem. If this occurs, contact your Toro Distributor
for assistance.
7. After output functions testing is complete, discon-
nect the Diagnostic Display connector from the wire har-
ness connector and plug loop--back connector into wire
harness. Install cover onto control panel.
1
1. Wire harness connector
2. Loop- -back connector
TEC
OVERLAY
Page 5 - - 13
2
Figure 12
3. TEC controller
Figure 13
Electrical System
3