Throttle Switch (Model 31902 And 31903) - Toro Groundmaster Series Service Manual

Throttle Switch (Model 31902 and 31903)

Testing the Throttle Switch
Electrical System: Testing the Electrical Components
POSITION CLOSED
CIRCUITS
2 + 3, 5 + 6
INCREASE
SPEED
NEUTRAL NONE
DECREASE 2 + 1, 5 + 4
SPEED
The throttle switch is located on the operator's console. When the front of the
switch is depressed, the engine speed (RPM) will increase. When the rear of the
switch is depressed, the engine speed (RPM) will decrease. Refer to the engine
specification tables in Chapter 2 (page 2–1)
engine RPM for specific Groundsmaster 3200/3300/3310 machines.
The TDM display/controller monitors signals from the throttle switch. The TDM
display controller communicates the increase/decrease requests to the Yanmar
engine ECU via the CAN network.
The throttle switch and its circuit wiring can be tested using the TDM
display/controller; refer to
Troubleshooting (page
wiring are not functioning correctly, proceed with the following test procedure:
1. Park the machine on a level surface, lower the cutting unit (or attachment),
engage the parking brake, set the key switch to the O
the key from the key switch.
2. Disconnect the battery negative (-) cable at the battery; refer to
and Installing the Battery (page
3. Remove the operator's console covers; refer to
Operator's Console Covers (page
4. Disconnect the wire harness connector from the switch and remove the
switch from the console if necessary. Check the switch and the harness
connector for damage or corrosion and clean or repair if necessary.
5. Use a multimeter (ohms setting) and the preceding table to determine
whether continuity exists between the various terminals for each switch
position.
6. Replace the switch if necessary.
7. If the switch tests correctly and a circuit problem still exists, check the wire
harnesses; refer to
8. Install the switch and connect the wire harness after testing.
9. Install the console covers.
10. Connect the battery negative (-) cable at the battery.
for the minimum and maximum
Using the TDM Display/Controller Screens for
3–12). If testing determines that the switch and circuit
6–64).
7–23).
Appendix A (page A–1).
Page 6–26
position and remove
FF
Removing
Removing and Installing the
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A