Efi Troubleshooting; Troubleshooting 6 - Toro Workman HDX Service Manual

Ignition Coil
The ignition coils are used to initiate the combustion pro-
cess by applying voltage to the spark plug. This voltage
creates a spark that ignites the compressed air/fuel mix-
ture at the precise moment needed.
The ignition coils have 12v DC current applied to them
when the ignition key is ON to energize the coil windings.
The ECU will trigger the coils to apply voltage to the
spark plug when appropriate. Ignition--timing advance is
controlled by the ECU which varies the point when the
spark is initiated at the plug in relation to where the pis-
ton is located in degrees before top dead center. Dy-
namic ignition timing advance offers optimal torque and Figure 29
economy for any given RPM and engine load.

EFI Troubleshooting

Information on EFI troubleshooting is in the EFI Trouble-
shooting Guide that is included at the end of this section.
Use this information when troubleshooting a problem
that affects the engine EFI system.
Rev. A
Workman HDX Page 3 - - 27 Briggs/Daihatsu Gasoline Engine