Troubleshooting - Toro 74939 Operator's Manual

Troubleshooting

Problem
The malfunction Indicator Light (MIL)
comes on.
The starter does not crank.
The engine will not start, starts hard, or
fails to keep running.
Possible Cause
1. The engine is too hot.
2. There is old gas in the gas tank.
3. The fuel shut-off valve is not open
completely.
4. The air cleaner is dirty.
5. The battery is not charged.
6. Incorrect fuel filters are being used or
dirty fuel filters.
7. The connections to sensors electronic
control unit (ECU) and fuel injectors
are not secured properly.
8. The battery has low voltage.
9. The 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 fuel shutoff valve is closed.
3. The oil level in the crankcase is low.
4. The throttle is not in the correct position.
5. There is dirt in fuel filter.
6. There is dirt, water, or stale fuel is in
the fuel system.
7. The air cleaner is dirty.
8. The seat switch is not functioning
properly.
9. The electrical connections are
corroded, loose or faulty.
10. The relay or switch is defective.
11. The spark plug is faulty.
12. The spark plug wire is not connected.
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Corrective Action
1. Turn the engine off and let it cool.
2. Use new gas.
3. Open the fuel shut-off valve.
4. Make sure that the air cleaner and
precleaner are clean. Replace if
necessary.
5. Charge or replace the battery.
6. Contact an Authorized Service Dealer.
7. Contact an Authorized Service Dealer.
8. Ensure that a good 12 volt battery is
being used and is fully charged.
9. 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. Open the fuel shutoff valve.
3. Add oil to the crankcase.
4. Be sure that the throttle control is
midway between the "SLOW" and
"FAST" positions.
5. Replace the fuel filter.
6. Contact an Authorized Service Dealer.
7. Clean or replace the air cleaner
element.
8. Check the seat switch indicator.
Replace the seat if needed.
9. Check the electrical connections for
good contact. Clean the connector
terminals thoroughly with electrical
contact cleaner, apply dielectric grease,
and reconnect.
10. Contact an Authorized Service Dealer.
11. Clean, adjust, or replace spark plug.
12. Check the spark plug wire connection.