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KTM 500 EXC - Engine Performance and Fuel Consumption Issues; FI Warning Lamp (MIL) Codes

KTM 500 EXC
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20 TROUBLESHOOTING 100
Faults Possible cause Action
The engine cannot be cranked (elec-
tric starter)
Operating error Carry out the start procedure. ( p. 32)
Battery is discharged
Charge the battery. x ( p. 80)
Check the charging voltage. x
Check the closed current. x
Check the stator winding of the alternator. x
Main fuse blown Change the main fuse. ( p. 81)
Fuse 5 blown Change the fuses of individual power
consumers. ( p. 82)
Starter relay defective
Check the starter relay. x
Starter motor defective
Check the starter motor. x
Engine turns but does not start Operating error Carry out the start procedure. ( p. 32)
Coupling of fuel hose connection not
joined together
Join the fuel hose connection.
Fuse 1 blown Change the fuses of individual power
consumers. ( p. 82)
Fuse 2 blown Change the fuses of individual power
consumers. ( p. 82)
Idle speed is not set correctly
Adjust the idle speed. x ( p. 91)
Spark plug oily or wet Clean and dry the spark plug or replace if nec-
essary.
Electrode distance (plug gap) of spark
plug too wide
Adjust the plug gap.
Guideline
Spark plug electrode gap
0.9 mm (0.035 in)
Ignition system defective
Check the ignition system. x
Short-circuit cable in wiring harness
frayed, kill switch or emergency OFF
switch defective
Check the wiring harness. (visual check)
Check the electrical system.
Defect in fuel injection system Read out the fault memory using the KTM diag-
nostics tool. x
Engine does not speed up Defect in fuel injection system Read out the fault memory using the KTM diag-
nostics tool. x
Ignition system defective
Ignition coil - check the secondary winding. x
Check the spark plug connector. x
Check the stator winding of the alternator. x
Engine has too little power Air filter heavily contaminated
Clean the air filter and air filter box. x
( p. 54)
Fuel filter is very dirty
Change the fuel filter. x
Fuel screen is very dirty
Change the fuel screen. x ( p. 93)
Defect in fuel injection system Read out the fault memory using the KTM diag-
nostics tool. x
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
Check exhaust system for damage.
Change the glass fiber yarn filling of the main
silencer. x ( p. 55)
Valve clearance too little
Adjust the valve clearance. x
Ignition system defective
Ignition coil - check the secondary winding. x
Check the spark plug connector. x
Check the stator winding of the alternator. x
Engine dies during the trip Lack of fuel Refuel. ( p. 35)
Fuse 1 blown Change the fuses of individual power
consumers. ( p. 82)
Fuse 2 blown Change the fuses of individual power
consumers. ( p. 82)
Fuse 5 blown Change the fuses of individual power
consumers. ( p. 82)

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