Engine Electronic Control Unit (Ecu); Yanmar Engine Electrical Components - Toro Groundsmaster 5900 Series Service Manual

Engine Electronic Control Unit (ECU)

Yanmar Engine Electrical Components

Groundsmaster ® 5900 & 5910
16227SL Rev B
g288258
1. Yanmar engine ECU
The Yanmar engine that powers your Groundsmaster uses an Electronic Control
Unit (ECU) for engine management. The engine ECU communicates with the
Toro Electronic Controller (TEC) and the InfoCenter display on the machine. The
engine ECU is located on the left side of the machine frame near the engine.
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.
If the engine ECU is to be disconnected for any reason, make sure that the
key switch is in the OFF position with the key removed for a minimum of thirty
(30) seconds before disconnecting the engine ECU. Also, to prevent possible
ECU damage when welding on the machine, disconnect the engine ECU from
the machine before welding.
When servicing or troubleshooting the engine electrical components, use the
correct engine service manual and troubleshooting manual. Also, the Yanmar
SMARTASSIST− Direct electronic control diagnostics service system is available
to support the error diagnosis and maintenance services of engine electrical
control devices.
Figure 136
Page 6–5
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Electrical System: General Information