High Pressure Fuel Line; Purge Port And Vent Hose Assembly; Throttle Body/Intake Manifold Assembly; Troubleshooting - Kohler Command Pro ECV850 Service Manual

EFI SYSTEM
5. If battery voltage is not present and/or test light does not illuminate, connect red lead of DVOM to red wire of plug
and black lead to a battery ground while key is still ON.
6. If battery voltage is present, turn key switch OFF and connect an ohmmeter between terminals on FPM to check
for continuity. If battery voltage at plug was confi rmed, and there was continuity across FPM terminals, reconnect
plug to FPM, making sure you have a good connection. Turn on key switch and listen for FPM to activate.
a. If FPM starts, repeat steps 2 and 3 to verify correct pressure.
b. If FPM still does not operate, replace it.
7. If battery voltage was not present at connector inspect fuse and wiring harness.

High Pressure Fuel Line

High pressure fuel line is mounted to bracket on intake manifold. No specifi c 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 specifi c 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 fi tting
is specifi c 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.
Faulty spark plugs.
Fuel pump not running.
Fuel pressure low.
Insuffi cient fuel delivery.
Engine Starts Hard
or Fails to Start TPS set incorrect (ECU Reset and TPS Initialization).
When Hot.
Crankshaft position sensor loose or faulty.
TPS faulty.
Engine temp sensor faulty.
Faulty injectors.
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Possible Cause
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