4924 690 01 Rev. K KohlerEngines.com
EFI SYSTEM-ECH
Troubleshooting Guide
Condition Possible Cause
Engine Starts Hard
or Fails to Start
When Hot.
Faulty spark plugs.
Fuel pump not running.
Fuel pressure low.
Insuffi cient fuel delivery.
TPS set incorrect (ECU Reset and TPS Initialization).
Crankshaft position sensor loose or faulty.
TPS faulty.
Engine temp sensor faulty.
Faulty injectors.
Engine Stalls or
Idles Roughly
(cold or warm).
Faulty spark plugs.
Insuffi cient fuel delivery.
TPS set incorrect.
TPS faulty.
Faulty engine temperature sensor.
Faulty injectors.
Engine Misses,
Hesitates, or Stalls
Under Load.
Fuel injector(s), fuel fi lter, fuel line, or fuel pick-up dirty/restricted.
Dirty air cleaner.
Insuffi cient fuel pressure or fuel delivery.
Vacuum (intake air) leak.
Improper governor setting, adjustment or operation.
TPS faulty, mounting problem or TPS Initialization Procedure incorrect.
Bad coil(s), spark plug(s), or wires.
Low Power
Faulty/malfunctioning ignition system.
Dirty air fi lter.
Insuffi cient fuel delivery.
Improper governor adjustment.
Plugged/restricted exhaust.
One injector not working.
Basic engine problem exists.
TPS faulty or mounting exists.
Throttle plate in throttle body not fully opening to WOT stop (if equipped).
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