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1
No load engine speed inspection.
9 Operate the engine with no load.
2,600 r/min / Economy control switch-ON
3,400 r/min / Economy control switch-OFF
GOOD
Check the hour meter light.
LIGHT OFF
Interface unit inspection.
Measure the voltage of the 3-pole coupler on the inter-
face unit.
R/B-G/Y 12V (Main switch-ON)
R/W-G/Y 12V(Main switch-START)
NOT GOOD
Check the wire harness
connection.
Control units (master and slave side) voltage
inspection.
Measure the voltage of the 2-pole couplers on master
and slave side of the control unit.
Master side Y-G 24V
Slave side R-Br 24V
GOOD
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3
OUT OF SPECIFICATION
Refer to "THROTTLE-
CONTROL
SYSTEM"
(page 21).
LIGHT ON
GOOD
Replace the interface
unit.
NOT GOOD
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4
GENERATOR SYSTEM
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2
Communication line inspection.
Check connection of the communication lines
between the interface unit and control unit.
GOOD
Control unit (slave side) output inspection.
Disconnect the 2-pole coupler (black) from the slave
side control unit.
Start the engine and check the overload warning light.
LIGHT ON
Control unit (master and slave side) output inspection.
Disconnect the 2-pole couplers (black) from the mas-
ter and slave side of the control unit.
Check the both output voltage.
GOOD
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5
19
ELEC
NOT GOOD
Correct the wire harness
connection.
LIGHT OFF
NOT GOOD
Replace the control unit
with AC output defect
side.
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6
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