Kohler Command PRO ECV630 Service Manual page 46

EFI SYSTEM-ECV
Diagnostic Aid #6 IGNITION SYSTEM
(no spark)
Condition
● Spark plug
● Plug wire
● Coil
● Coil circuit(s), pin circuits Grey 10 and Black 1.
● ECU grounds
● ECU
● Vehicle safety interlocks, ground signal on safety wire.
Diagnostic Aid #7 FUEL SYSTEM ELECTRICAL
(no fuel delivery)
Condition
● No fuel
● Air in high pressure fuel line
● Fuel valve shut OFF
● Fuel filter/line plugged
● Injector circuit(s), pin circuits Black 5 and Black 6
● Injector
● ECU grounds
● ECU
● Lift pump not working
Diagnostic Aid #8 FUEL SYSTEM
(fuel pressure)
Low Fuel Pressure-Condition
● Low fuel
● Fuel filter plugged
● Fuel supply line plugged
● Lift fuel pump - insufficient fuel supply
● Fuel pump (lift or module) - internally plugged
Low Fuel Pressure-Condition
● Pressure regulator not functioning properly inside fuel
pump module.
Diagnostic Aid #9 BASIC ENGINE
(cranks but will not run)
Condition
● Refer to basic engine troubleshooting charts within
Troubleshooting, Electronic Fuel Injection System-
ECVl EFI, and Electrical Systems.
46 KohlerEngines.com 24 690 02 Rev. D