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Groundsmaster 4500--D/4700--D Page 5 -- 3 Electrical System
Yanmar Engine Electronic Control Unit (ECU)
The Yanmar engine that powers the Groundsmaster
4500--D and 4700--D uses an electronic control unit
(ECU) for engine management and also to communi-
cate withthe TEC controllers and the InfoCenter Display
on the machine. All engine ECU electrical connectors
should beplugged into the controller before themachine
ignition switch is moved from the OFF position to either
the ONor START position.If the engine ECUis to bedis-
connected for any reason, make sure that the ignition
switch is in the OFF position with the key removed be-
fore disconnecting the engine ECU. See Chapter 3 --
Yanmar Diesel Engine for additional engine ECU in-
formation.
IMPORTANT: Do not plug or unplug the engine ECU
for a period of thirty (30) seconds after the machine
ignition switch is turned OFF. The ECU may remain
energized even though the ignition switch is OFF.
Figure 2
1. Engine (models 30873 and 30874)
2. Engine ECU
1
2
Figure 3
1
2
1. Engine (models 30881 and 30882)
2. Engine ECU
Electrical
System