Fuel System Troubleshooting; Fault Messages - Kohler 6VSG Service Manual

4.6 Fuel System Troubleshooting

Most problems with gas fuels involve either fuel
pressure or fuel regulator
troubleshooting consists of verifying fuel pressures
and checking each fuel system component.
Check the following items:
• Check primary fuel regulator outlet pressure. This is
the line pressure.
• Check the primary regulator vent for obstructions
and clean, if necessary.
• Check fuel shutoff inlet pressure.
• Check secondary fuel regulator inlet pressure.
• Check fuel inlet pressure at the gas mixer.
• Perform fuel system maintenance if necessary. See
Section 2.10, Fuel System Maintenance.
Fault Message
AC Sens Loss Shutdwn
(Loss of AC sensing shutdown)
AC Sens Loss Warning
(Loss of AC sensing warning)
AccyPwrOver Warning
Aux Input Shutdwn *
(Auxiliary input shutdown)
Aux Input Warning *
(Auxiliary input warning)
Batt Chg Flt Warning *
(Battery charger fault warning)
Battery High Warning
Battery CRLow Warning †
52 Section 4 Troubleshooting
function. Basic
Action Description/Comments
Shutdown The controller shut down the generator
because there was less than 5% of rated
voltage measured on Phase A for
3 seconds, only in AUTO, only after
acceptable voltage (> 5% of UV setting)
has been detected.
Warning The controller has measured less than
5% of rated voltage on Phase A for
1 second, 10 seconds after crank
disconnect.
Warning Accessory Power Overload. An
overcurrent fault (short circuit) on the
accessory power output.
Shutdown The controller shut down the generator
because the digital input for a custom
shutdown (AuxiliaryInputShutdown - PIM)
was activated (low).
Warning The digital input for a custom warning
(AuxiliaryInputWarning - PIM) is active
(low).
Warning The digital input for Battery Charger Fault
Warning (PIM) is active (low). For an
external battery charger only, not
applicable to the VSC built-in battery
charging.
Warning The controller has measured battery
voltage that is above the high warning
setting for 10 seconds or more.
Operates during exercise and normal
operation.
Warning Battery voltage dropped to 11 VDC or less
for 30 seconds or more.

4.7 Fault Messages

The VSC controller displays fault messages to aid in
troubleshooting. Fault messages, descriptions, and
recommended checks are listed in Figure 4-2.
Fault messages will also appear in the Event History in
SiteTech. The wording of the message in the Event
History may vary slightly from the message shown on
the controller display.
Identify and correct the cause of the fault condition.
Refer to the troubleshooting charts in Section 4.9 for
additional recommendations.
button to reset the controller after a fault shutdown.
Figure 4-2
Then press the OFF
Check
Check for loose wiring and
connections.
Check all AC leads.
Troubleshoot alternator.
Check for loose wiring and
connections.
Check all AC leads.
Troubleshoot alternator.
Check wiring to accessories.
Check PWR and COM
connections.
Troubleshoot the accessories.
Refer to the documentation
provided with the accessories.
Check customer equipment
connected to the PIM module
Check customer equipment
connected to the PIM module
Check customer equipment
connected to the PIM module.
Check engine starting battery.
Check engine starting battery.
Check battery charger DC
output voltage from VSC on lead
CHO to the battery.
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