4.3L V-6 Engine

• Unit Not In Auto LED 12
  Fix: Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting.
• Low Fuel LED 11
  Fix: Check fuel supply and replenish as required.
• UNIT WILL START THEN FAIL — Overspeed light lit
  Cause: Lost governor control; Defective overspeed switch
• UNIT WILL START THEN FAIL — Overcrank light lit
  Cause: Lost signal on Mag Pickup Crank Disconnect Terminal or lost signal on Auxiliary Crank Disconnect terminal after unit started
• UNIT WILL START THEN FAIL — Low Oil light lit
  Cause: Low oil in crankcase; Oil pump failed; Defective pressure switch
• UNIT WILL START THEN FAIL — Loss of Fuel
  Cause: Empty fuel tank; Restricted fuel filter; Restricted, broken or loose fuel line
• UNIT WILL START THEN FAIL — Loose or Open Connections
  Cause: May have lost power to control or ignition system
• UNIT WILL START THEN FAIL — High Water Temperature light lit
  Cause: Low water level in radiator; Thermostat closed; Broken fan belt; Restricted flow through radiator; Ambient temperature too high; Defective temperature switch
• UNIT STARTS BUT STARTER DOES NOT DISENGAGE — Voltage on Terminal #3 After Unit Running
  Cause: Signal must be present at either Terminal #5, 6, 7, or 12 after unit starts to operate crank disconnect of control
• UNIT STARTS BUT STARTER DOES NOT DISENGAGE — No Voltage on Terminal 49 After Unit is Running
  Cause: Starter drive could be hanging up or the solenoid on starter is not disengaging
• UNIT NOT IN AUTO LED — Indicates AUTO/OFF/MANUAL switch is in the OFF position which will prevent automatic starting if an automatic transfer switch is used. *7
  Fix: Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting
• UNIT DOES NOT START — Voltage on Terminal #2 While Cranking
  Cause: If present may have defective fuel valve, defective ignition system or loose connection
• UNIT DOES NOT START — Fuel Supply
  Cause: Empty fuel tank; Air in fuel lines; Wrong pressure on Natural Gas or LPG
• PRE-HI ENGINE TEMP LED. Engine continues to operate — Indicates engine has begun to overheat and engine temperature has risen to approximately 215°F (105°C). If generator is powering non critical and critical loads and cannot be shut down. Use the following: #14
  Fix: Reduce load if possible by turning off non-critical loads; Check air inlets and outlets and remove any obstructions to airflow; Open doors or windows in generator area to increase ventilation; If engine can be stopped, follow procedure in Step 2
• PRE LOW OIL PRESSURE LED. Engine continues to operate — Indicates engine oil pressure has dropped to 20 psi (138kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow Step 4 procedure. If engine can be stopped, follow procedures in Step 4. *3

Compiled from service & troubleshooting documentation across every generator set that uses the 4.3L V-6.

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.