Kohler 125EOZ/100EFOZ, Service Manual, Page: 69 / 148

TP-5737 5/01 55 Section 6 Decision-Maker
t
1 Controller Troubleshooting
The engine starts but
shuts down after 30
seconds or more?
Replace the inoperative
start/stop switch
Replace the circuit board
(inoperative K2 relay).
B
No
Yes
The engine runs but
cannot be stopped by
the start/stop switch
Check the condition/connections
of the start/stop switch (local or
remote). See the Wiring
Diagrams. Does the start/stop
switch function correctly and the
wiring check out okay?
Yes
No
Yes
Is the K3 relay
LED3 lit?
No
Check for 120-volts AC output
from the stator 10-7 winding at V0
and V7. See Section 7, Stator
Testing. Run the generator set
while performing this test
Test the speed sensor operation
as described in Section 7
If correct voltage is present and
the speed sensor tests okay,
replace the circuit board
Note : Allow a 60-second
cooldown between cranking
attempts if the set does not start
Is the K1
relay
LED1 lit?
No
Replace the
circuit board
Yes
Do the engine
systems including low
oil pressure, high
engine temperature,
and high exhaust
temperature circuits
checkout okay?
No
Repair/replace
the inoperative
engine system
Yes
Replace the
circuit board