Kohler Aegis LH775 Service Manual

41
EFI System
66 690 07 Rev. -- KohlerEngines.com
Code 52
Component: Injector #2 circuit open, shorted to
ground, or shorted to battery.
Fault: Injector #2 is not functioning because
circuit is open, shorted to ground, or
shorted to battery.
Condition: Engine will run very poorly with only
one cylinder functioning.
Conclusion: Injector Related
● Injector coil shorted or opened.
Engine Wiring Harness Related
● Broken or shorted wire in harness.
ECU pin 15 to injector pin 2. ECU
pin 28 to fuel pump relay pin 86.
Note: after key-off then key-on code
56 would be set also. Fuel pump
relay pin 87 to injector pin 1.
● Opened main fuse F1.
Fuel Pump Relay Related
● Bad fuel pump relay. Primary side
functional, but pin 30 to pin 87
remains open. Primary side pin 85 to
pin 86 is open or shorted during
engine operation. Note: after key-off
then key-on code 56 would be set
also.
ECU Related
● Circuit controlling injector #2
damaged.
● Circuit controlling fuel pump relay
damaged.
Code 55
Component: MIL (Diagnostic lamp) circuit open,
shorted to ground, or shorted to battery.
Fault: MIL is not functioning because circuit is
open, shorted to ground, or shorted to
battery.
Condition: Engine will run normally if no other errors
are present.
Conclusion: MIL (diagnostic lamp) Related
● MIL element opened or element
shorted to ground.
● Lamp missing.
Engine Wiring Harness Related
● Broken or shorted wire in harness.
ECU pin 29 to lamp open or shorted.
Vehicle Wiring Harness Related
● Broken or shorted wire in harness.
Power lead to MIL open or shorted.
ECU Related
● Circuit controlling lamp damaged.
Code 56
Component: Fuel pump relay circuit open, shorted to
ground, or shorted to battery.
Fault: Fuel pump, ignition coils, and fuel
injectors will not function because fuel
pump relay circuit is either open, shorted
to ground, or may be ON continuously if
shorted to battery.
Condition: Engine will not run, or fuel pump will
continue to run when switch is off.
Conclusion: Fuel Pump Relay Related
● Bad fuel pump relay. Primary side open
or shorted.
Fuel Pump Related
● Fuel pump open or shorted internally.
Engine Wiring Harness Related
● Fuel pump fuse F1 open.
● Broken or shorted wire in harness.
ECU pin 28 to fuel pump relay pin 86.
Ignition switch to fuel pump relay pin
85.
ECU Related
● Circuit controlling fuel pump relay
damaged.
Code 61
Component:
Fault:
Condition: Denotes end of fault codes. If signaled
fi rst, no other fault codes are present.
Conclusion:
Troubleshooting Flow Chart
Following fl ow chart provides an alternative method
of troubleshooting EFI system. Chart will enable you
to review entire system in about 10-15 minutes. Using
chart, accompanying diagnostic aids (listed after chart),
and any signaled fault codes, you should be able to
quickly locate any problems within system.

Kohler Aegis LH775 Specifications

General

Brand	Kohler
Model	Aegis LH775
Category	Crankshaft
Language	English