Arctic Cat 660 cc - Troubleshooting Engine

2-68
Troubleshooting
Engine
Problem: Engine Does Not Start (No Spark at Spark Plugs)
Condition Remedy
1. Ground connections dirty — loose
2. Wiring harness shorting — disconnected
3. Emergency stop switch in DOWN position —
malfunctioning
4. Throttle/ignition monitor switch
malfunctioning
5. Spark plugs fouled — damaged
6. Idle speed control (ISC) not functioning
7. ECU faulty
8. Ignition timing sensor faulty
1. Check all ground connections — clean and tight
2. Repair — replace — connect wiring harness
3. Move switch to UP position — replace throttle
control
4. Adjust throttle cable tension — replace throttle
body assembly
5. Clean — replace spark plugs
6. Turn ignition switch ON and OFF — listen for
stepping motor operation
7. Replace ECU
8. Replace sensor
Problem: Engine Does Not Start (No Fuel at Cylinders)
Condition Remedy
1. Gas tank empty
2. Fuel pressure regulator faulty
3. Gasoline contaminated
4. Fuel pump faulty
5. Fuel hose broken — pinched
6. Gas-tank vent — hose obstructed
7. Pick-up valve(s) obstructed — damaged
8. Compression absent
9. ECU faulty
1. Fill tank
2. Replace regulator (in gas tank - Bearcat/660
STD) or (on fuel rail - 660 Turbo)
3. Replace gasoline
4. Service — replace fuel pump — connections —
wires
5. Replace — service hose
6. Remove obstruction — replace vent — hose
7. Remove obstruction — replace pick-up valve(s)
8. Repair — replace damaged — worn engine
components
9. Replace ECU