Engine Electronic Control Unit (Ecu) - Toro Groundsmaster 5900 Series Service Manual

Engine Electronic Control Unit (ECU)

Groundsmaster ® 5900 & 5910
16227SL Rev B
g287514
1. Engine
The Yanmar engine that powers your Groundsmaster uses an Electronic Control
Unit (ECU) for engine management and also to communicate with the Toro
Electronic Controller (TEC) and the operator InfoCenter display on the machine.
All wire harness electrical connectors should be plugged into the ECU before
the machine key switch is moved from the OFF position to either the ON or
START position.
The engine electrical components (e.g. 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 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 a period of thirty (30)
seconds after the machine key switch is turned OFF. The ECU may
remain energized even though the key switch is OFF.
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Figure 13
2. Engine ECU
IMPORTANT
Page 4–3 Yanmar Diesel Engine: General Information
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