TP-5867 11/02 17Section 3 Troubleshooting
Section 3 Troubleshooting
Use the following tables as a quick reference in
troubleshooting individual problems. Generator set
faults are listed in groups and include likely causes and
remedies. The reference column provides additional
sources of information in this and related manuals
regarding the problem and solution. Corrective action
and testing in many cases requires knowledge of
electrical and electronic circuits. Have an authorized
service distributor/dealer perform service work.
General Troubleshooting Chart
Problem Possible Cause Corrective Action Reference
Generator set
Weak or dead battery Recharge or replace battery. Operation Manual (O/M)
does not crank
Reversed or poor battery
connections
Check connections. —
Defective starter relay Check continuity of circuit.
Sections 6, Component Testing
and Adjustment, and 9, Wiring
Diagrams
Defective starter Rebuild or replace. Engine Service Manual (S/M)
Defective controller start/stop
switch
Test function of switch. Sections 4, Controller
Troubleshooting and 9, Wiring
Diagrams
Fuse blown in controller Replace fuse; if fuse blows again,
check circuit and components.
Section 4, Controller
Troubleshooting, and O/M
Open circuit in wiring, terminals
pin, circuit board, etc.
Check continuity. Sections 4, Controller
Troubleshooting and 9, Wiring
Diagrams
Defective controller circuit board Check circuit board operation. Section 4, Controller
Troubleshooting
Overcrank shutdown Check engine fuel and ignition
systems. Shutdown occurs after
30 seconds of cyclic cranking.
Section 6.11, Fuel Systems, and
Engine S/M for ignition system
information
Faulty spark plugs or loose
connections
Replace and regap spark plugs. Section 2.3, Spark Plugs
Defective fuel regulator/valve Check regulator/valve operation. Sections 6.11, Fuel Systems, and
4, Controller Troubleshooting
Faulty ground (--) connection Clean and retighten. —
Insufficient fuel pressure on
LP/natural gas systems
Check fuel pressure Section 6.11.3, Fuel Regulators
Weak or dead battery Recharge or replace. Section 2.7, Battery
Generator set
Fuel not turned on Turn on fuel valve. —
cranks but
does not start
Air cleaner clogged Clean or replace. Section 2.4, Air Cleaner Element
and Precleaner
Defective ignition system spark
control or ignition coil
Test and/or replace components. Engine S/M
Blown voltage regulator fuse Replace fuse. If fuse blows again,
check generator components.
O/M
Blown controller fuse Replace fuse; if fuse blows again,
check circuit and components.
Section 4, Controller
Troubleshooting, and O/M
Open wiring terminal or pin
(P2 connector)
Check continuity. Section 9, Wiring Diagrams
Overspeed setting on electronic
governor board set too low
Readjust overspeed on governor
board.
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