EFI SYSTEM
38
19 690 01 Rev. --
KohlerEngines.com
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 con
fi
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 speci
fi
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 speci
fi
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 speci
fi
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
Possible Cause
Engine Starts Hard
or Fails to Start
When Cold.
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).
TPS faulty.
Engine temp sensor faulty.
Faulty coils.
Low system voltage.
Faulty injectors.
Faulty battery.
Loose or corroded connections.
Engine Starts Hard
or Fails to Start
When Hot.
Faulty spark plugs.
Fuel pump not running.
Fuel pressure low.
Insuf
fi
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.
Summary of Contents for Command Pro ECV850
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