Kohler ECV940 Service Manual page 44

EFI SYSTEM-ELECTRONIC THROTTLE BODY (ETB)
Troubleshooting Guide
Condition
Faulty spark plugs.
Fuel pump not running.
Fuel pressure low.
Insuffi cient fuel delivery.
Engine Starts Hard
TPS set incorrect (ECU Reset).
or Fails to Start
Crankshaft position sensor loose or faulty.
When Hot.
TPS faulty.
Engine temp sensor faulty.
Faulty injectors.
Vapor lock.
Faulty spark plugs.
Insuffi cient fuel delivery.
Engine Stalls or
TPS set incorrect.
Idles Roughly
TPS faulty.
(cold or warm).
Faulty engine temperature sensor.
Faulty injectors.
Fuel injector(s), fuel fi lter, fuel line, or fuel pick-up dirty/restricted.
Dirty air cleaner.
Insuffi cient fuel pressure or fuel delivery.
Engine Misses,
Hesitates, or Stalls
Vacuum (intake air) leak.
Under Load.
Improper governor operation.
TPS faulty.
Bad coil(s), spark plug(s), or wires.
Faulty/malfunctioning ignition system.
Dirty air fi lter.
Insuffi cient fuel delivery.
Plugged/restricted exhaust.
Low Power
One injector not working.
Basic engine problem exists.
TPS faulty.
Throttle plate in electronic throttle body not fully opening to WOT.
44
Possible Cause
KohlerEngines.com 62 690 05 Rev. H