Increment/Decrement Switch
The increment/decrement switch is used as an input for
the engine control module to raise or lower the engine
speed in small amounts. When the switch is depressed
and held in the forward position, the engine speed will
increase. Conversely, when the rear of the switch is de-
pressed, engine speed will decrease. The increment/
decrement switch is located on the steering tower (Fig.
75).
1
Testing
1.
Before disconnecting the increment/decrement
switch for testing, the switch and its circuit wiring should
be tested as a TEC controller input with the Info Center
Diagnostic Display (see Info Center Display in this sec-
tion).
2
Figure 75
Steering tower
Increment/decrement switch
2.
decrement switch and circuit wiring are functioning cor-
rectly, no further switch testing is necessary.
If the Diagnostic Display verifies that the increment/
1.
2.
3.
ment/decrement switch and circuit wiring are not func-
tioning correctly, test increment/decrement switch.
If the Diagnostic Display determines that the incre-
4
5
2
6
3
4.
ignition switch.
Make sure ignition switch is OFF. Remove key from
5.
Remove front steering tower cover (see Steering
1
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis). Locate increment/decrement
switch and unplug wire harness connector from switch.
BACK OF SWITCH
Figure 76
6.
76.
The switch terminals are marked as shown in Figure
The circuit logic of the increment/decrement switch
is shown in the chart to the right. With the use of a multi-
meter (ohms setting), the switch functions may be
tested to determine whether continuity exists between
the various terminals for each position. Verify continuity
between switch terminals. Replace switch if testing
identifies a faulty switch.
SWITCH
CLOSED
OPEN
POSITION
CIRCUITS
CIRCUITS
SPEED
INCREASE
2 + 3
5 + 6
2 + 1
5 + 4
NEUTRAL
NONE
ALL
SPEED
DECREASE
2 + 1
5 + 4
2 + 3
5 + 6
7.
testing.
Connect the harness connector to the switch after
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.
Installfrontsteeringtowercover(seeSteeringTower
Assembly in the Service and Repairs section ofChapter
-- Chassis).
7
Electrical System
Page 5 -- 42
Groundsmaster 5900/5910
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