Kohler 6VSG Service Manual page 60

Problem Possible Cause
Stops Fault shutdown
suddenly
No fuel
Fuel line restriction
Fuel lines too long
Air cleaner clogged Check for a dirty air cleaner
Spark plug(s)
Engine overheated
(hot engine only)
Low oil pressure
(LOP) switch
Fuel valve/fuel
regulator
Engine overloaded
Engine speed
sensing
connections
Ignition module
Loss of generator
output voltage to
controller
W/D = Wiring Diagram(s) (Section 7)
I/M = Generator Set Installation Manual
S/S = Generator Set Specification Sheet
60 Section 4 Troubleshooting
Test
Check for a fault shutdown
message on the controller display.
Identify the cause of the fault.
Check fuel valves and fuel supply. Open manual fuel valve. Contact
Inspect fuel lines.
Check fuel line length and pipe
size.
element.
Check spark plug(s).
Check air intake and generator set
enclosure air inlets and outlet.
Use oxygen sensor to check fuel
mixture.
Check oil level.
Check oil pressure.
Attempt startup. If unit shuts
down, remove lead from LOP
switch and reset controller. A
successful restart attempt
indicates a faulty LOP shutdown
switch.
Note: Check engine oil pressure
before performing test and/or
replacing LOP shutdown switch.
Check fuel valve connections.
Check regulator/valve operation.
Check fuel pressure.
Reduce electrical load and check
operation.
Check for loose connections: V7,
V8, V9, and connections to the line
circuit breaker.
Test the ignition system according
to the instructions in the engine
service manual.
Check connections at P2 plug.
Check continuity of AC sensing
leads 11 and 44. See Section 5 for
alternator test procedures.
Engine S/M = Engine Service Manual
O/M = Generator Set Operation Manual
Corrective Action
Correct the fault and then press
the controller's OFF button to reset
the controller.
fuel supplier to replenish fuel
supply.
Clear restriction.
Contact fuel supplier to replace
fuel lines with larger pipe.
Replace air cleaner element.
Replace or regap plug(s).
Clear air intake and enclosure air
inlets and outlets.
Adjust fuel mixture.
Add oil. Check and replace oil at
the intervals shown in the Service
Schedule.
See engine S/M.
Replace faulty LOP shutdown
switch.
Note: Check engine oil pressure
before performing test and/or
replacing LOP shutdown switch.
Tighten fuel valve connections.
Replace damaged wires.
Replace regulator or valve.
Unplug some lights or appliances
connected to the generator set.
Tighten connections. Replace
damaged wiring.
Service the ignition system
according to the instructions in the
engine service manual.
Tighten connections at P2 plug.
Replace wiring if damaged.
Repair or replace components if
necessary, as indicated by tests in
Section 5.
Reference
Section 4.7
—
—
Generator set
S/S, I/M
O/M
O/M
O/M
Section 5.8
O/M
Engine S/M
Section 5.7.2
Section 5.8.2
—
W/D Section 7
Engine S/M
Section 7
Section 5.3
Section 5
TP-6844 1/13