Kohler Command PRO ECV630 Service Manual page 37

5. If no voltage is observed, connect red lead of meter to red wire of plug and black lead to a good ground while key
is still ON.
6. If voltage is between 7 and 14, turn key switch OFF and connect an ohmmeter between terminals on pump to
check for continuity.
a. If there was no continuity between pump terminals, replace fuel pump.
b. If voltage was below 7, test wiring harness.
7. If voltage at plug was good, and there was continuity across pump terminals, reconnect plug to pump, making
sure you have a good connection. Turn on key switch and listen for pump to activate.
a. If pump starts, repeat steps 2 and 3 to verify correct pressure.
b. If pump still does not operate, replace it.
High Pressure Fuel Line
High pressure fuel line is mounted to intake manifold. No specific servicing is required unless operating conditions
indicate that it needs replacement. Thoroughly clean area around all joints and relieve any pressure before starting
any disassembly.Detach by removing two mounting screws, wire ties, and injector retaining clips.
Purge Port and Vent Hose Assembly
No specific servicing is required for vent hose assembly or purge port unless operating conditions indicate
replacement is required. All components are serviced individually. Abrasion sleeves on hoses should be reused
or replaced when servicing vent hoses. Please note vent hose routing and replicate after service or component
replacement to prevent pinching or abrasion of vent hoses. Only Kohler replacement parts can be used because fitting
is specific to system and must be maintained. Visit KohlerEngines.com for recommended Kohler replacement parts.
Throttle Body/Intake Manifold Assembly
NOTE: ECU Reset is required if throttle body is replaced.
Throttle body is serviced as an assembly, with throttle shaft, TPS, throttle plate, and idle speed adjusting screw
installed. Throttle shaft rotates on needle bearings (non-serviceable), capped with seals to prevent air leaks.
TROUBLESHOOTING
Troubleshooting Guide
Condition
Fuel pump not running.
Faulty spark plugs.
Old/stale fuel.
Incorrect fuel pressure.
Crankshaft position sensor loose or faulty.
TPS set incorrect (ECU Reset and TPS Learn).
Engine Starts Hard
or Fails to Start TPS faulty.
When Cold.
Engine temp sensor faulty.
Faulty coils.
Low system voltage.
Faulty injectors.
Faulty battery.
Loose or corroded connections.
24 690 02 Rev. D
Possible Cause
KohlerEngines.com
EFI SYSTEM-ECV
37