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Groundsmaster 5900/5910 Page 5 -- 41 Electrical System
Throttle Control Switch
The throttle control switch is used as an input for the en-
gine control module to adjust the engine speed to one
of three (3) RPM settings: low idle (1350 RPM), mid idle
(2400 RPM) or high idle (2750 RPM). The throttle con-
trol switch is located on the steering tower (Fig. 73).
Testing
1. Before disconnecting the throttle control switch for
testing, the switch and its circuit wiring should be tested
as a TEC controller inputwith the Info Center Diagnostic
Display (see Info Center Display in this section).
2. If the Diagnostic Display verifies that the throttle con-
trol switch and circuit wiring arefunctioning correctly, no
further switch testing is necessary.
3. If the Diagnostic Display determines that the throttle
control switch and circuit wiring are not functioning cor-
rectly, test throttle control switch.
4. Make sure ignition switch is OFF. Remove key from
ignition switch.
5. Remove front steering tower cover (see Steering
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis). Locate throttle control switch
and unplug wire harness connector from s witch.
6. The switch terminals are marked as shown in Figure
74.Thecircuitlogicofthe throttle controlswitchisshown
in the chart to the right. With the use of a multimeter
(ohms setting), the switch functions may betestedtode-
termine whether continuity exists between the various
terminals for each position. Verify continuity between
switch terminals. Replace switch if testing identifies a
faulty switch.
7. Connect the harness connector to the switch after
testing.
8. If switch tests correctly and circuit problem still ex-
ists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Draw-
ings).
9. Installfrontsteering tower cover (see SteeringTower
Assembly inthe Service and Repairs section of Chapter
7 -- Chassis).
1. Steering tower 2. Throttle control switch
Figure 73
1
2
Figure 74
12
4
3
56
BACK OF SWITCH
SWITCH
POSITION
CLOSED
CIRCUITS
OPEN
CIRCUITS
LOW IDLE 2+1
5+4
2+3
5+6
MID IDLE 2+3
5+4
2+1
5+6
HIGH IDLE 2+3
5+6
2+1
5+4
Electrical
System