Troubleshooting Flowchart - Kohler 7.5EOR Service

6.3 Troubleshooting Flowchart

Use the flow chart (Figure 6-3) to aid in troubleshooting
the generator set. If the prescribed remedy does not
correct the problem, replace the circuit board.
Press the start switch
(local or remote).
No
Check the controller fuse.
Is the controller fuse
okay?
No Yes
Replace the
fuse.
S Check the condition/
connections of the
start/stop switch
(N, 43, and 47).
S Check the battery
condition and
connections.
S Check the connections
at P1--14.
S Check for battery voltage at
P1-14 (+) and P2-4 (--).
Do all check out okay?
Yes
Replace
the circuit
board.
Figure 6-3 Troubleshooting the Relay Controller Circuit Board (1 of 4)
34 Section 6 Controller Troubleshooting
Does the engine crank?
No
Is the K2 relay LED lit?
No
Verify voltage into control
board on P1-14 and P2-4.
No Yes
Replace The K3 relay or
the circuit K1 relay is faulty.
board. Replace the
circuit board.
Is the K20 relay
No
functioning?
Replace the
K20 relay.
Yes
Yes
Is the K3 relay LED lit?
Is voltage present at the K20 relay coil?
No
Check the K3 relay—voltage
present at P1-14 and P1-9?
No
Replace
the circuit
board.
Is voltage present
No
at the S relay coil?
Yes
Check the
P4--22
connection.
Go to
A
Yes
Yes
Yes
Check the
P1--4
connection.
Yes
Is voltage present at
the S relay contact
(starter motor side)?
No Yes
Repair the
Replace
starter
the S relay.
motor.
TP-6073 4/06