Kohler 4EF, Service Manual

Page: 37 / 72

TP-5986 4/03 23 Section 6 Controller Troubleshooting
Does the engine have proper oil
pressure? Use a mechanical
gauge to verify pressure.
Does the K5 relay LED
light after 5--10 seconds
of running time?
Yes
Does the engine continue
to run after the start
switch is released?
Yes
No
Does the K1
relay LED light?
Does using the stop switch
stop the engine?
Yes
The generator set is
functioning properly?
No
Yes
Go to D
(next page).
No
No
Replace the circuit
board (the K5 relay
is inoperative).
Did the K4 relay LED light?
Replace the
circuit board
(inoperative
K4 relay).
B
Is the temperature
(HET) safety shutdown
switch functional?
Replace the inoperative
temperature switch.
Yes
Yes
Yes
Is the K3 LED out?
Replace the circuit board
(the K6 relay is inoperative).
No
Yes
C
Is the LOP switch
functional?
Replace
LOP switch.
No
Yes
No
No
Is the low coolant
switch functional?
Yes
Replace the switch. No
Is the coolant level low?
No
Yes
Fill the cooling
system and check
for leaks.
Check the oil level.
Repair/replace the oil pump.
Figure 6-5 Troubleshooting Relay Controller Circuit Board (3 of 4)