Kohler Command CH620 Service Manual page 35

Troubleshooting eChoke
Condition
Engine starts hard, runs rough, or
stalls at idle speed.
Engine runs rich (indicated by black,
sooty exhaust smoke, misfi ring, loss
of speed and power, governor
hunting, or excessive throttle
opening).
Engine runs lean (indicated by
misfi ring, loss of speed and power,
governor hunting, or excessive
throttle opening).
Starting an Engine Equipped with eChoke
1. This eChoke system automatically controls choke plate position for starting.
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2. Activate starter switch. Release switch as soon as engine starts.
3. If engine does not start, remove air cleaner system from carburetor.
4. Confi rm connection of stepper motor assembly to carburetor.
5. With key switch set to OFF, choke plate should be fully closed.
6. Confi rm movement of choke plate:
a. Shut off key switch and test for full travel of rotary stepper motor by disconnection and reconnection of
negative (ground) contact at battery.
b. If there is still no movement, separate tests to validate battery voltage and power and ground connection to
master controller need to be performed.
7. If movement is noted, attempt to crank and start engine. (Do not exceed 10 seconds of cranking.)
24 690 06 Rev. O
Related Causes
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Possible Cause
Choke not closing/moving
a. Broken or missing link.
b. Loss of constant power or
switched power.
c. Loss of system ground.
d. Fusible link is open.
e. Stepper motor not functioning.
f. Electronic component in
Master ignition/control module
is not functioning.
Choke partially closed during
operation.
a. Broken or missing link.
b. Loss of constant power or
switched power.
c. Loss of system ground.
d. Fusible link is open.
e. Stepper motor not functioning.
f. Electronic component in
Master ignition/control module
is not functioning.
Key integrated component in Master
ignition/control module is not
functioning.
Incorrect set up of stepper motor/link/
bracket to carburetor.
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KohlerEngines.com
Fuel System
Conclusion
Stepper motor/bracket/link assembly
must allow for full travel, make sure
link is located properly and
connected.
Bad wire harness connection, fusible
link failure.
Component failure in Master
controller/ignition.
Bad Master Controller harness.
Stepper motor/bracket/link assembly
must allow for full travel, make sure
link is located properly and
connected.
Bad wire harness connection, fusible
link failure.
Component failure in Master
controller/ignition.
Bad Master Controller harness.
Bad ignition module on specifi c
cylinder.
Stepper motor/bracket/link assembly
must allow for full travel, make sure
link is located properly and
connected.
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