Kohler Command PRO EFI ECH749 [48/180] Efi system electronic throttle body etb ech
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Kohler Command PRO EFI ECH749 [48/180] Efi system electronic throttle body etb ech

Kohler Command PRO EFI ECH749 [48/180] Efi system electronic throttle body etb ech
EFI SYSTEM-ELECTRONIC THROTTLE BODY (ETB) ECH
48
24 690 01 Rev. OKohlerEngines.com
b. Test light confi rmation: Turn key off . Disconnect DVOM. Connect 12 volt test light across terminals in plug. Key
needs to remain off for a minimum of 30 seconds before proceeding. Turn key on. Confi rm test light illuminates
for approximately 6 seconds. After approximately 6 seconds, test light will remain off unless another prime
cycle is initiated.
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 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.
Electronic Throttle Body (ETB)/Intake Manifold Assembly
NOTE: ECU Reset is required if electronic throttle body is replaced.
Electronic throttle body (ETB) is serviced as an assembly, with throttle shaft, TPS, and throttle plate installed. Throttle
shaft rotates on needle bearings (non-serviceable), capped with seals to prevent air leaks.
ETB can be tested using KOHLER
®
Diagnostic System (KDS) Gen 2, see Tools and Aids,. Select Throttle Position
Test and follow instructions in help (?) area of test.
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).
TPS faulty.
Engine temp sensor faulty.
Faulty coils.
Low system voltage.
Faulty injectors.
Faulty battery.
Loose or corroded connections.

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