Toro Groundsmaster 4500-D Series Service Manual page 288

Engine Electronic Control Unit (ECU) (continued)
Electrical System: General Information
any reason, make sure that the ignition switch is in the OFF position with the key
removed before disconnecting the engine ECU. See
Unit (ECU) (page 4–3).
Do not plug or unplug the engine ECU for a period of thirty (30)
seconds after the machine ignition switch is turned OFF. The ECU
may remain energized even though the ignition switch is OFF.
IMPORTANT
Page 6–6
Engine Electronic Control
Groundsmaster ® 4500-D/4700-D
19245SL Rev A