Troubleshooting - Toro 74933 Operator's Manual

Troubleshooting

Problem
Malfunction Indicator Light (MIL) comes
on.
The starter does not crank.
The engine will not start, starts hard, or
fails to keep running
The engine loses power.
Possible Cause
1. The engine is too hot.
2. Fualty valve in fuel tank.
3. The air cleaner is dirty.
4. The battery is not charged.
5. The connections to sensors electronic
control unit (ECU) and fuel injectors
are not secured properly.
6. Low voltage coming from the battery.
7. A fuse is blown.
1. The blade control switch (PTO) is
engaged.
2. The parking brake is not on.
3. The drive levers are not in neutral lock
position.
4. The operator is not seated.
5. The battery is dead.
6. The electrical connections are corroded
or loose.
7. The fuse is blown.
8. The relay or switch is defective.
1. The fuel tank is empty.
2. The oil level in the crankcase is low.
3. The throttle and choke are not in the
correct position.
4. There is dirt in fuel filter.
5. There is dirt, water, or stale fuel is in
the fuel system.
6. The air cleaner is dirty.
7. The seat switch is not functioning
properly.
8. The electrical connections are
corroded, loose or faulty.
9. The relay or switch is defective.
10. The spark plug is faulty.
11. The spark plug wire is not connected.
1. The engine load is excessive.
2. The air cleaner is dirty.
3. The oil level in the crankcase is low.
4. The cooling fins and air passages
above the engine are plugged.
5. The vent hole in the fuel cap is plugged.
6. There is dirt in the fuel filter.
7. There is dirt, water, or stale fuel is in
the fuel system.
62
Corrective Action
1. Turn engine off and let it cool.
2. Contact an Authorized Service Dealer.
3. Make sure that the air cleaner and
precleaner are clean. Replace if
necessary.
4. Charge or replace the battery.
5. Contact an Authorized Service Dealer.
6. Ensure a good 12 volt battery is being
used and is fully charged.
7. Check and replace any blown fuses.
1. Move the blade control switch (PTO)
to disengaged.
2. Set the parking brake.
3. Ensure that the drive levers are in the
neutral lock position.
4. Sit on the seat.
5. Charge the battery.
6. Check the electrical connections for
good contact.
7. Replace the fuse.
8. Contact an Authorized Service Dealer.
1. Fill the fuel tank.
2. Add oil to the crankcase.
3. Be sure that the throttle control is
midway between the "SLOW" and
"FAST" positions.
4. Replace the fuel filter.
5. Contact an Authorized Service Dealer.
6. Clean or replace the air cleaner
element.
7. Check the seat switch indicator.
Replace the seat if needed.
8. Check the electrical connections for
good contact. Clean the connector
terminals thoroughly with electrical
contact cleaner, apply dielectric grease,
and reconnect.
9. Contact an Authorized Service Dealer.
10. Clean, adjust, or replace spark plug.
11. Check the spark plug wire connection.
1. Reduce the ground speed.
2. Clean the air cleaner element.
3. Add oil to the crankcase.
4. Remove the obstruction from the
cooling fins and air passages.
5. Clean or replace the fuel cap.
6. Replace the fuel filter.
7. Contact an Authorized Service Dealer.