Toro STX-38 EFI Operator's Manual page 43

Problem
The hydraulic fluid overflows or is very hot.
The engine-indicator light is illuminated.
Possible Cause
1. The cooling fan is not functioning.
1. There is a fault in the engine
electronic-control unit.
41
Corrective Action
1. Check the fuse and replace it if
necessary.
1. Refer to a Kohler engine dealer for
diagnosis and service.