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Groundsmaster 4000--D/4010--DPage 3 -- 6Yanmar Diesel Engine
Engine Electronic Control Unit (ECU)
The Yanmar engine that powers your Groundsmaster
uses an electronic control unit (ECU) for engine man-
agement and also to communicate with the machine
TEC controllers and the operator Info Center display on
the machine. All wire harness electrical connectors
should be plugged into the engine ECU before the ma-
chineignitionswitchismovedfromtheOFFpositionto
either the ON or START position.
NOTE: On models 30607 and 30609, a ground wire is
used to ground the engine ECU to the machine frame.
The groundwire is connected to theECU with oneof the
mounting screws and is connected to the frame at the
engine mount.
The engine electrical components (e.g. engine ECU,
fuel injectors, EGR, exhaust DPF) are identified and
matchedin the engine ECUprogram. Ifengine electrical
components are replaced on the engine, the Yanmar
electronic tool must be used to update the engine ECU
program which will ensure correct engine operation.
If the engine ECU identifies that an engine problem ex-
ists, the engine speed may be reduced or the engine
might stop. The Yanmar electronic tool and
troubleshooting manual should be used to provide as-
sistance in identifying the cause of the problem and the
repairs that are necessary. Contact your Toro distributor
for assistance in Yanmar engine troubleshooting.
IMPORTANT: Do not plug or unplug the engine ECU
for a period of thirty (30) seconds after the machine
keyswitch isturnedOFF.The ECUmay remain ener -
gized even though the ignition switch is OFF.
If the engine ECU is to be disconnected for any reason,
make sure that the ignition switch is in the OFF position
with the key removed before disconnecting the engine
ECU. Also, to prevent possible ECU damage when
welding on the machine, disconnect and remove the en-
gine ECU from the machine before welding.
Figure 1
1. Electronic control unit (30603 / 30605)
2. Alternator
2
1
Figure 2
1. Electronic control unit (30607 / 30609)
2. Alternator
2
1