Component Testing
For accurate resistance and/or continuity checks, elec-
trically disconnect the component being tested from the
circuit (e.g. unplug the ignition switch connector before
checking continuity on the switch).
CAUTION
When testing electrical components for continu-
ity with a multimeter (ohms setting), make sure
that power to the circuit has been disconnected.
NOTE: For engine component testing information, see
Engine,
Series at the end ofChapter 3 -- Kubota Die-
the
03--M--E3B
sel Engine.
Kubota
Workshop
Manual,
Diesel
Ignition Switch
The ignition (key) switch on the console arm has three
6. If ignition switch tests correctly and circuit problem
still exists, check wire harness (see Electrical Schemat-
ics and Wire Harness Drawings in Chapter 10 -- Foldout
Drawings).
(3)
positions (OFF, ON/PREHEAT and START) (Fig.
15).
Testing
7.
connector to the ignition switch.
After testing is completed, connect the wire harness
1.
Before disconnecting the ignition switch for testing,
the switch and its circuit wiring should be tested as a
TEC--5002 input with the Diagnostic Display (see Diag-
nostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the igni-
tionswitchandcircuitwiringarefunctioningcorrectly,no
further switch testing is necessary. If, however, the Dis-
playdeterminesthattheignitionswitchandcircuitwiring
are not functioning correctly, proceed with test.
8.
in the Service and Repairs section of Chapter 7 -- Chas-
sis).
Assemble console arm (see Console Arm Assembly
2
2.
Make sure ignition switch is OFF. Remove key from
ignition switch.
3.
switch (see Console Arm Disassembly in the Service
and Repairs section of Chapter 7 -- Chassis).
Disassemble console arm to gain access to ignition
4.
Disconnect wire harness electrical connector from
the ignition switch.
5.
The ignition switch terminals are identified as shown
1
in Figure 16. The circuit logic of the ignition switch is
shown in the chart below. With the use of a multimeter
(ohms setting), the switch functions can be tested to de-
termine whether continuity exists between the various
terminals for each switch position. Verify continuity be-
tweenswitchterminals.Replaceignitionswitchiftesting
identifies that switch is faulty.
Figure 15
1.
Console arm
2.
Ignition switch
ON/PREHEAT
45
o
45o
OFF
START
POSITION
OFF
CIRCUIT
NONE
A
F
ON/PREHEAT
START
B + C + F, D + E
A + B + C
B
C
E
D
FRONT VIEW
REAR VIEW
Figure 16
Electrical System
Page 5 -- 20
Groundsmaster 4000--D/4010--D
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