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).
1
Testing
1.
Before disconnecting the throttle control switch for
testing, the switch and its circuit wiring should be tested
as aTECcontroller inputwith theInfo Center Diagnostic
Display (see Info Center Display in this section).
2.
trol switch and circuit wiring are functioning correctly,no
Ifthe Diagnostic Display verifies thatthe throttlecon-
2
further switch testing is necessary.
Figure 73
2.
3.
control switch and circuit wiring are not functioning cor-
If the Diagnostic Display determines that the throttle
1.
Steering tower
Throttle control switch
rectly, test throttle control switch.
4.
ignition switch.
Make sure ignition switch is OFF. Remove key from
4
5
2
6
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 switch.
1
3
6.
74.
The switch terminals are marked as shown in Figure
Thecircuitlogicofthethrottlecontrolswitchisshown
BACK OF SWITCH
in the chart to the right. With the use of a multimeter
(ohmssetting),theswitchfunctionsmaybetestedtode-
termine whether continuity exists between the various
terminals for each position. Verify continuity between
switch terminals. Replace switch if testing identifies a
faulty switch.
Figure 74
SWITCH
POSITION
CLOSED
CIRCUITS
OPEN
CIRCUITS
LOW IDLE
MID IDLE
HIGH IDLE
2 + 1
2 + 3
5 + 6
7.
testing.
Connect the harness connector to the switch after
5
+ 4
2 + 3
5 + 4
2 + 1
5 + 6
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).
2 + 3
5 + 6
2 + 1
5 + 4
9.
Installfrontsteeringtowercover(seeSteeringTower
Assembly in the Service and Repairs section ofChapter
-- Chassis).
7
Groundsmaster 5900/5910
Page 5 -- 41
Electrical System
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