Component Testing; Ignition Switch - Toro Reelmaster 3550-D Preliminary Service Manual

Component Testing

For accurate resistance and/or continuity checks, elec-
trically disconnect the component being tested from the
circuit (e.g. unplug the ignition switch connector before
checking continuity on the switch terminals).
NOTE: For engine component testing information, see
the Kubota Workshop Manual: 05 Series Diesel Engine.

Ignition Switch

The ignition (key) switch is located on the control panel
and has three (3) positions: STOP, RUN and START
(Fig. 14). The Toro Electronic Controller (TEC) monitors
the operation of the ignition switch.
Testing
1. Park machine on a level surface, lower cutting units,
engage parking brake and stop engine. Remove key
from ignition switch.
2. Before disconnecting the ignition switch for testing,
the switch and its circuit wiring should be tested as a
TEC electrical input using the Diagnostic Display (see
Diagnostic Display in the Troubleshooting section of this
chapter). If input testing verifies that the ignition switch
and circuit wiring are functioning correctly, no further
ignition switch testing is necessary. If, however, input
testing determines that the ignition switch and circuit
wiring are not functioning correctly, proceed with the fol-
lowing ignition switch testing procedure.
3. Remove cover from control panel to access ignition
switch.
4. Make sure ignition switch is in the OFF position. Dis-
connect wire harness connector from ignition switch.
5. The ignition switch terminals are identified in Figure
14 and the circuitry of the switch is shown in the chart in
Figure 15. With the use of a multimeter (ohms setting),
the switch functions can be tested to determine whether
continuity exists between the various terminals for each
switch position. Verify continuity between switch termi-
nals.
6. Replace ignition switch if testing determines that it is
faulty.
Electrical System
When testing electrical components for continu-
ity with a multimeter (ohms setting), make sure
that power to the circuit has been disconnected.
7. If the ignition switch tests correctly and a circuit prob-
lem still exists, check wire harness.
8. After testing is complete, connect machine wire har-
ness connector to ignition switch. Install cover onto con-
trol panel.
STOP
FRONT VIEW
SWITCH
POSITION
STOP
RUN
START
NOTE: Ignition switch terminals 1 and 6 are connected
internally. Terminals 4 and 5 are also connected internal-
ly. These terminals should have continuity regardless of
switch position.
Page 5 - - 16
CAUTION
RUN
START
REAR VIEW
Figure 14
CIRCUITS
1 + 6
1 + 3 + 4 + 5 + 6
1 + 2 + 4 + 5 + 6
Figure 15
Reelmaster 3550--D