jcb JS130, Service Manual

Page: 198 / 533

9 - 18
Section C Electrics
9803/6410
Section C
9 - 18
Issue 1
Fault Finding
Fault Diagnosis (continued)
Engine Problem, Problem No 12
Note: Engine revolutions do not change with throttle volume control.
Prior Confirmation
Items
1 The message "Engine emergency stop" is not displayed.
Troubleshoot Cause Remedy
Replace
Controller defect or controller
bad connection of or clean
CN10 connector CN10
connector
terminal.
Replace
Throttle volume throttle
defect. volume.
Breakage or
defective wiring
Repair
GrL, GrR, Gr between of the
CN10 and throttle GrL, GrR,
volume Gr.
Replace
Controller defect controller.
Breakage of GL Repair
wiring GL wiring
Replace
Driver defect driver.
Change voltage moving
throttle volume with
self-check.
Is it within the range of
0~4.5V?
YES
YES
YES
NO
NO
NO
Without removing CN10
connector, change the
voltage between GrR +
and Gr - moving the
throttle volume.
Is it within the range of
0~4.5V?
Remove throttle volume
connector, measure
resistance between throttle
volume side connector GrR
and GrL. Is it within the
range of 0~1 ?
YES
NO
Remove controller CN4 and
driver CN15. Is GL wiring
continuous?
Check motor transmitted
pulse by self-check.
Is it within the range of
500~1023?
Remove throttle volume
connector, measure
resistance between throttle
volume side connector GrR
and Gr. Is it within the range
of 0~1 ?
Even though the
throttle motor is
moving.
YES
YES
NO
NO
Key switch ON