Toro Groundsmaster 4500-D Series Service Manual page 76

Engine Electronic Control Unit (ECU) (continued)
Yanmar Diesel Engine: General Information
g307584
1. Electronic control unit (30885 / 30887)
2. Engine ECU
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 exists, the engine speed
may be reduced or the engine might stop. The Yanmar electronic tool and
troubleshooting manual should be used to provide assistance in identifying the
cause of the problem and the repairs that are necessary. Contact your Toro
distributor for assistance in Yanmar engine troubleshooting.
Do not plug or unplug the engine ECU for minimum period of thirty
(30) seconds after the machine key switch is turned OFF. The ECU
may remain energized 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 engine ECU from the machine before
welding.
Figure 8
(Tier 4)
IMPORTANT
Page 4–4 Groundsmaster ® 4500-D/4700-D
19245SL Rev A