Toro Groundsmaster 4000-D Service Manual page 24

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-
chine ignition switch is moved from the OFF position to
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 ground wire is connected to the ECU with one of 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
matched in the engine ECU program. If engine 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
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
key switch is turned OFF. The ECU may 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.
Yanmar Diesel Engine
electronic tool and
Page 3 - - 6
2
Figure 1
1. Electronic control unit (30603 / 30605)
2. Alternator
2
Figure 2
1. Electronic control unit (30607 / 30609)
2. Alternator
Groundsmaster 4000--D/4010--D
1
1