Throttle Switch - Toro Groundsmaster 5900 Series Service Manual

Throttle Switch

Testing
Electrical System: Component Testing
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1. Operator control console
The throttle switch is located on the console arm
of the throttle switch is depressed and held, the engine rpm will increase to its
HIGH idle setting. When the rear of the throttle switch is depressed and held,
the engine rpm will decrease to its LOW idle setting. If the throttle switch is
depressed momentarily, the engine speed will increase or decrease in 100 RPM
increments accordingly.
The engine speed switch is used as an input for the engine electronic control unit
to raise or lower the engine speed. When the switch is depressed and held in the
forward position, the engine speed will increase. Conversely, when the rear of
the switch is depressed, engine speed will decrease.
The master controller monitors the position of the throttle switch (increase
or decrease). Using input from the throttle switch the master controller
communicates the desired change in engine RPM to the Yanmar ECU via the
CAN network. The Yanmar ECU adjusts the engine throttle a requested.
1. Park machine on a level surface, lower cutting decks and stop engine.
Remove key from key switch.
2. Turn battery−disconnect switch to the OFF position.
3. Disassemble the console arm to gain access to the switch (see
Arm (page 7–35)).
4. Disconnect machine wire harness connector from the switch being tested.
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5. The switch terminals are marked as shown in
of the throttle switch is shown in below table. With the use of a multimeter
(ohms setting), the switch functions may be tested to determine whether
continuity exists between the various terminals for each switch position.
Verify continuity between switch terminals.
2
Figure 214
2. Throttle switch
Figure 215
Back of Switch
Page 6–74
1
(Figure 214). When the front
Console
Figure 215. The circuit logic
Groundsmaster ® 5900 & 5910
16227SL Rev B