Fuel/Lubrication/Cooling; Throttle Body - Toro 500 EFI Service Manual

Fuel/Lubrication/Cooling

TROUBLESHOOTING
1. Verify that the electric fuel pump is operating by lis-
tening for a "whirring" sound for approximately
three seconds after the ignition switch is turned to the
ON position. If no sound can be heard, see Fuel
Pump/Fuel Level Sensor in Electrical System.
2. Check for a flashing EFI icon on the LCD. If EFI is
flashing, see EFI Diagnostic System in Electrical
System.
3. Check the air filter housing and air filter for contam-
ination. Clean or replace as necessary (see Periodic
Maintenance).

Throttle Body

! WARNING
Whenever the gasline hoses are removed (other than for
pressure testing), the battery must be disconnected to
prevent inadvertent activation of the electronic fuel pump.
! WARNING
Whenever any maintenance or inspection is performed
on the fuel system during which there may be fuel leak-
age, there should be no welding, smoking, open flames,
etc., in the area.
REMOVING
1. Turn the ignition switch to the OFF position; then
remove the ignition switch key.
! WARNING
Do not turn the ignition switch to the ON position with
the hoses removed. Gasoline will be pumped by the
electric fuel pump causing a safety hazard.
2. Remove the seat, seat back, and seat base; then dis-
connect the battery.
3. Remove the air inlet boot between the air filter and
throttle body; then disconnect the MAP sensor con-
nector (A), fuel injector connector (B), and ISC con-
nector (C).
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4. Remove the screw from the throttle arm cover and
remove the cover; then loosen the jam nut and dis-
connect the throttle cable.
5. Slowly disconnect the gasline hose connector from
the fuel rail.
! WARNING
Gasoline may be under pressure. Place an absorbant
towel under the connector to absorb any gasoline spray
when disconnecting.
HDX048A
HDX043A
HDX044A