Toro 74256 Operator's Manual page 58

Problem
Malfunction Indicator Light (MIL)
comes on.
Possible Causes
1. Old gas in gas tank or fuel shut
off valve not open completely.
2. Fuel tank vent cap is blocked.
3. Air cleaner is dirty.
4. Incorrect fuel filters used or
dirty fuel filters.
5. Connections to sensors,
electronic control unit (ECU),
and fuel injectors are not
secured properly.
6. 12 volt battery being used is
not fully charged.
58
Corrective Action
1. Use new gas and ensure shut
off valve is open.
2. Make sure fuel tank vent cap is
not blocked and working
properly.
3. Make sure air cleaner and
precleaner is clean. Replace if
necessary.
4. Install correct fuel and ensure
that it is clean.
5. Ensure all connections to
sensors are properly secured.
6. Ensure a good 12 volt battery
is being used and fully charged.